I'm planning to get a Sidekick LX and I think a lot of the vinyls for them look cool. But are they as good as they say they are?

Like do they stay on a long time? And that kind of thing.

here is a pic of one of them

http://www.amazon.com/T-mobile-Sidekick-skin-skins-LX-100/dp/B00166HCTY/ref=pd_sbs_misc?ie=UTF8&qid=1214279120&sr=8-36
I'm talking about the stickers you stick on the phone. If someone people didn't get the part where I said vinyls.