Ya. me too. I have tried a few! some have done ok... others haven't.
Well if you're more skeptical to try something that sounds too awesome or too easy.... welll then check out this girl's blog "Pintester" as she tests some of them out and lets you know if it worked for her. Might save you a bit of trouble later on!!!!!!
and if it helps, i find her SO funny!!! :) always important i think