Review (5/5): Pee with your pants on!
This is the product you need for those nasty bathrooms, outhouses, or out on the trail. I love this thing because it's a hard plastic and extends pretty far back. No leakage. I tried the Freshette with disastrous results, and since bought the pstyle. Much better product, and cheaper!
It's foolproof, really. Just put it in position, close the to body and, let 'er rip! It's made my potty breaks while backpacking a much shorter affair. No learning curve involved.
Wipe it out or rinse when you're done and seal in a ziploc bag. It can get funky after a day or so if you don't get all the residual off of it before stowing.