The switch tester is a fairly sturdy piece of acrylic and has been a great way to teach others about the differences in mechanical switches. It, more than my keyboards, was a gateway for my wife to realize that she wanted a keyboard of her own. She had fun picking the switches. My only gripe is that some of the switches are a bit loose and fall out easily, but that shouldn't be a dealbreaker for anyone.
I love it. It has been sitting on my office desk for about two weeks and every time someone visits they always play with it. It has helped me encourage some of my coworkers(developers) to look into getting a mechanical keyboard. Sad part is they all seem to like the quiet ones.