Aussiebum suits are hot - I have quite a few of them, but the Wonderjock thing is marketing hype and a waste - it really doesn't do anything. I wasn't out to get a classic Wonderjock suit, but the color I wanted only came with it at the time, so I wound up with one. It's just this little pocket in the front you're supposed to put your balls into, and it's supposed to push you up and out, but it really doesn't work that way. It isn't comfortable, at least for my balls, and you constantly fall out of the pocket unless you're just laying down on the beach or something.
You can read around some speedo fet boards and find out the same thing. There was even one good thread where a guy ordered both, and took pictures with and without, and it doesn't make any material difference. Also, speedo freaks have been doing this for years, just by making a strategically-placed horizontal slit in the liner of a regular speedo-style suit, and pushing their balls through it. If you make the slit in the right place - above your balls but not too high, it supposedly gives you some lift. Never tried it myself though.
I'm not saying not to get an Aussiebum suit - in the right size and color, they look, fit, and feel hot, but don't expect any magic from the Wonderjock thing. You do have to size them a bit carefully - they're all-nylon, so there's zero stretch, and they're not comfortable and they don't look good if you go too tight, especially if you have some flab. Their size guidelines are pretty good, but if in doubt, size up rather than down.