I use the Champion Suspensory (
link here) I found through International Jock.
It's VERY supportive and roomy if you get the XL pouch. The band is adjustable and has a button clasp for easy on and off once you get it adjusted. It can take some getting used to because it's basically a pouch that grips behind yyour balls and lifts them with no back straps or anything, but it's the only thing I've personally found comfortable.
There are a few cons to it. If you wear it a bit tight, the button isn't the strongest in the world, so a good safety pin to back up the button is advisable if you're using it purely for support.
The other is a half pro, half con. Due to the nature of it (That beign it's a pouch pulling your balls forward AND something that is slinging under your penis and pulling IT up and forward as well) is the bulge it can cause. If ya wanna flaunt, then it's hunky dory. If you don't, then I'd not wear these.
Finally, I leave it with the good. It's comfortable and hardly binding, it keeps them close to the body (which in warmer weather can arguably lead to less than prime sperm, but some could consider that a pro since it's semi-effective temporary birth control, though I've not really noticed anything sufficient in anything else.) It leaves your penis free so it's not being bound (which was always a bit problem of mine wearing anything else.) but if you DO still want to wear undergarments OVER it, it's very small and barely adds any cloth over anything, so that's doable too. I'd reccommend a pair of boxers since I have that whole leaking issue myself. :V Never could wear boxers though... goes back to the binding thing... Ah well. Thems be my thoughts of the moment. Just a random post from a random stumbler.