Product review (4 stars): The first one broke, so I bought another
This is the second time I have ordered this dishwasher alert via Amazon.  It serves its purpose well and is simple and streamlined.  I had to order a second one because somehow the first one broke.  It was a while ago, so I don't remember exactly how it broke - we might have dropped something on it and the bottom slide piece broke off (see picture), or it may have broken on its own from the stress of using the slider, I cannot recall so I will not place the blame on anyone.  It was kindof disappointing how easily it broke, though, so I long resisted getting a new one since $6-and-change feels like a lot to pay (twice) for a little flimsy piece of plastic.  Alas, the desire to know the state of one's dishes without having to open the door has prevailed, so I forked over the dollars.

Both of the dishwasher alerts were black, despite the one in the picture being white.  I would have liked a white one, since I have a white dishwasher, but oh well.  I put it on the top of the door and it is visible, but not gaudy or anything.  If you have a dishwasher that has buttons on the top or the door is recessed, then you would have to put this somewhere else.  I wish it didn't say "Dishwasher Alert" on the slider because it distracts a bit from the words "Clean" and "Dirty" and because a plain black slider would look much more slick.  I will probably take a sharpie to it and color over it.  As previously mentioned, the slides can easily be busted, so be careful.

The sticky tape is one time use only and it only includes one strip, but if you need to relocate it, all you have to do is get new double-sided tape.  The tape that it comes with is strong and secure so I never had to deal with it detaching or anything, but it was easy enough to remove when it came time to replace it.  The tape left some sticky residue behind but it came off with water and strong wiping (it should come right off with some Goo Gone).  Since this was on the top of the dishwasher and is under the counter where we do all our food prep, there was some gunky stuff that had collected underneath the alert and in the gaps, but it all wiped off also.  The major thing of note is that the tape left a yellow rectangle on the top of the (white) dishwasher that was still visible after everything had been cleaned (see picture).  This discoloration might be bad if you are renting or for whatever reason decide to remove the alert.  Thankfully, I was just replacing it with another alert.  I don't know how this discoloration might affect a black or stainless steel dishwasher, so take heed!

Overall, it is just plain useful.  Not having one for a while was a total #firstworldproblem, but now I am back in the land of luxury.