I've got a full body Zagg on my TP2. Was about $38 to have it installed at the mall. Mine is a very heavilly used phone so every once in a while part of the side starts wearing off. No biggie, as next time I'm in the mall they put a new one on for free.
I got one for my daughters PSPgo(full body) because she is abusive to it and so far that's worked out great.
A side benefit for having the full body ZAGG on my TP2 is that when my laptop is closed on my dock in my car, my phone actually stays put if I place it there to charge while I'm driving
I think the product is worth it for the cost truthfully