[Vibrant Accessories] DarkAgent:
I have been using Zagg's invisibleShield for my Vibrant. However, recently I got my phone replaced and since I have heard so many good things about Realook, I wanted to give Rk a try instead of just ordering a replacement iS. Now that I have experienced both (albeit, I have only been using Rk for a short amount of time whereas I have plenty of experience with iS since this is my second device with it), I figure I should share my findings with my fellow XDA'ers. Note this is a comparison of only screen protectors - not whole body protectors.

Size/Coverage

Winner: Realook

Both iS and Rk cover 98%+ of the screen, including the touchkeys at the bottom. Both iS and Rk have an opening cut out for the speaker (Rk has a hole for the speaker, covering above and below the speaker, while iS has a cut-out for the speaker, not covering the small area above it). Only iS has an opening cut out for the light sensors - Rk does not have a cut out for the light sensors.

Rk covers more of the phone than iS. With iS, there is about .5-1 cm uncovered area - on all sides - between the screen protector and the edge of the phone. The uncovered area is large enough that a simple case will not cover it (i.e. you may find it catching dust, etc.) but small enough to not cause you protection issues or worries. Rk, on the other hand, covers more area. Depending on how well you apply it, you can potentially have very little uncovered area between the screen protector and the edge of the phone. Any area that is uncovered is small enough to be covered by a simple case, so little to no dust or dirt should get there. Personally, I was able to apply Rk in such a way that for the top, right, and left my case covered whatever Rk did not; I was not so lucky for the bottom -- there is a very minor uncovered gap that will probably catch dirt, etc.

Application/Installation

Winner: Depends on personal preference

Rk and iS differ highly in how they are applied to the phone. Rk is a "dry install' while iS is a "wet install".

With iS you are provided with some liquid solution that you use to apply the protector onto your phone. You spray the liquid on your fingertips - to help avoid fingerprints - and on the protector, before applying the protector onto the phone.

With Rk you have to peel off protective covers (the protector is covered by two "covers" on the front and back which need to be peeled off) before applying the protector on your phone.

Both iS and Rk are easily reapply-able if you make a mistake in positioning the protector. I hear Rk can even be reapplied at later dates, but I have not tested this out personally so I don't know. iS is also supposedly reapply-able, but only if you have any solution left.

There are both advantages and disadvantages to the iS/wet and Rk/dry application methods.

Because iS uses a liquid solution to assist in applying the protector, it is much easier to avoid catching dust and dirt particles under the protector and to avoid fingerprint marks. On the other hand, air bubbles are likely to occur and you need to be sure to push out the air bubbles with something like a credit card. Also, since you don't have to worry about fingerprints (thanks to the liquid solution) it is a bit easier to hold and apply iS if you are clumsy, like me. You need to be careful to conserve the liquid solution, though, because once you are out, your short on luck: You can either beg customer service to send you another one, or order extra solution from somewhere.

The advantage Rk's dry install offers is immediate up-time, and little-to-no air bubbles in the main area of the screen (there may be air bubble at the edges and/or around the speaker, though). With iS, you need to allow the phone to "dry" for something like 8-10 hours, whereas you can start using your phone with Rk ASAP. On the other hand, dust and dirt particles will drive you mad while trying to apply Rk, and you need to be careful to not touch the adhesive side with your fingers otherwise you may have fingerprint issues.

Two things that irk me about Rk are the confusing installation directions (you really need to be skilled with your fingers to do it as they want you to), and the fact that there was dirt/dust on the covers that protect the screen protector. The protector itself was 100% clean -- the two covers that protect the front and back/adhesive side, though, were a bit dirty so when you try to position the protector on your screen, as per the directions, prior to pulling off the two protective covers, the dirt/dust gets transferred to your screen and if you aren't careful you may not wipe it off before applying the protector.

Quality

Winner: invisibleShield

Both are excellent quality -- they have little to no effect on picture quality when compared to a naked Vibrant. I bet most people wouldn't even notice you have a screen protector if not specifically looking for one.

However, one very minor issue I noticed is at the lowest brightness setting, Rk caused the screen to be minor-ly less bright than iS. This is very minor and no one will even notice it unless specifically looking for it. At higher brightness settings, this issue is not even ascertainable.

Both Rk and iS attract fingerprints easily, and Rk is a bit easier to wipe off than iS.

One major issue I found, though, are reflections. Rk claims to be "anti-reflective" and "anti-glare" (it also claims to be "anti-fingerprint", which it isn't as I just mentioned), but in reality that couldn't be any further from the truth. I kid you not when I say you may confuse your phone for a mirror if you have Rk -- the reflection is that bad. While inside it isn't too bad as long as you don't have a light source directly behind you. When outside, however, the reflection/glare (whatever you want to call it) is terrible. Even on full brightness the reflection/glare is very annoying while outside -- forget using your phone on low brightness, which is something I could sometimes get away when I used iS.

iS, on the other hand, does well in protecting against glares and reflections. Indoors, even with a light source directly behind me, the phone is still very usable. And as long as I keep the protector clean, iS causes no problems outdoors.

Texture

Winner: Realook

Here is one major area that Rk and iS differ. Rk has more of a "glass" texture to it, while iS is more "plasticky". In other words, with Rk you will have more smooth, glass like feeling while with iS you may find a bit more friction. That is not to say Rk is always smooth -- if you drag your finger on Rk without picking it up for too long you will start to feel lots of friction also. However, in general, Rk has a must better feel to it than iS. In fact, iS has somewhat of a "break-in" period where you may notice your fingers sticking to iS making using a touchscreen near impossible for the first few days.

Price

Winner: Depends on how many times you replace your phone

Realook costs you $10.99 with free shipping (both Amazon and eBay listings provide free shipping) for a two-pack.

invisibleShield screen protector only (not fully body cover) costs you $14.99 + shipping for one protector. (You may be able to get a 50% off coupon for iS if you submit your e-mail for their awards/giveaways program - I did.) However, iS has a "life-time guarantee" where you can get a "free" iS replacement if your screen protector ever gets scratched. (You may also get a free replacement if you get your device replaced, like a warranty replacement -- they allow you to do that.) I put free in quotes because, it isn't really free -- you have to pay $3.99 for shipping and send back the old screen protector (which will only cost you an envelope and a stamp).

Final Words

Both Realook and invisibleShield are top-class. They are both terrific products, both with advantages and disadvantages. Personally, I prefer Realook's "glassy" feeling and better coverage than iS but the reflection/glare on Realook is a deal breaker since I use my phone outside often. So, my next course of action will be to see if Realook has any sort of money back guarantee since this product fails to do as it advertises when it comes to reflection and glare. In other words, I am going with invisibleShield. For everyone else, however, I can't provide a general recommendation since everyone has their own tastes and preferences. I do hope, however, my comparison here helps you make your decision.