[G3 Accessories] christopherwoods:
I ordered the Ringke Slim case and Supcase black/clear case to do some comparisons. They were both pretty cheap.

Foxgguy2001 already did a pretty comprehensive review of the Supcase (and posted a Photoshop template for the back, very handy!) so I won't do an entirely new review. However, just wanted to add that the cutouts for the headphones and USB are generously proportioned. This is great - my TPU cover for my Samsung S3 was good, but the headphone socket was a bit snug and my Sennheiser jack only just held itself in (and frequently popped out if I moved around... No such problems with either LG case.)

The Ringke Slim case is 100% 'hard' plastic material. In truth it has a little give to it, you can bend it in your hands with moderate force which is good as it probably won't immediately shatter if dropped from waist height. It has diagonal cutaway grooves at each corner, making each side independent of the others, and a little flexible - allowing you to pop the phone in without much hassle.

In this regard it's therefore got a bit less holding tension than the Supcase -- certainly enough to keep it on, and there is a retaining lip to stop the phone simply falling out, but I'm not sure whether the phone would stay in if dropped from an excessive height or at a weird angle (but then you have bigger problems if you're dropping your phone from more than 3 feet / 1 metre!) The back of the Supcase to me looks very slightly like the cousin of a Griffin Survivor iPhone case... No arguments though, it's all well designed and has some thought put into it.

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The Ringke case came with a free "HD Crystal" screen protector (just the protector, no wipe or cloth or squeejee, but we all have loads of those -- and a few drops of soapy water is all you need to apply). Came with very comprehensive instructions and tips for a successful application, good customer support info too.

Unlike some more expensive film screen protectors, its cutouts for the front camera and sensors are well done with some nice indentations and precision angles -- for the total price, it's a really nice touch from Ringke to include a screen protector. My Spigen (which I managed to get loads of fluff underneath, d'oh!) probably won't last forever...

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For both cases, all cutouts are precise and smooth-edged. The Ringke case has nice tapered edges around the camera cutout and I estimate (purely visually) it's about 4 mm thick.

I took some test photos with flash using both cases which came out great, no haloing or flash refraction through the edge of the case. The Ringke has two small cutouts in the bottom-right corner to attach a charm (if you're a twelve year old girl) or lanyard.

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Ultimately, the Ringke case is such good value that even when the back scratches (which I'm sure it would given every day abuse) it's no real trial to buy a second one. Or buy multiple colours and swap between them!

I've gone with the slightly sturdier Supcase for the time being because its grip on the phone feels superior, and the slightly hard, rubbery texturised 'rim' gives me a bit more purchase (good, because I'm quite violent with my phone and also have very dry hands). The all-round lip which retains the phone on the Supcase is better than the easy-to-snap-in-but-slightly-looser Ringke. However, if your phone usually lives in a bag and just sits on an office desk, certainly give the Ringke Slim a try - you can see the whole phone through the transparent one (and it really does look quite pretty), it's quite discreet and still has decent grip factor considering it's just plastic.

They're only £6 each, why not buy both! :)