I've used H-Blocker, one of the original beta-alanine formulas. I've tried others and always go back to H-Blocker. It seems to have the right mix of B-A and caffeine and sugar for me. It really does help push thru that last set/rep or higher weight, and I've gotten definitely visible results from it.
WARNING: Lots of folks do not have a very good tolerance for it. I've given it to other friends, and one had to induce vomiting, he had such a strong reaction, and the other will remember his experience in the manner of a bad LSD trip involving his skin attacking him.
There definitely is a common side, which is the "prickly / electric" feeling you get under your skin. I used to get this same effect, but less strongly, when eating a big piece of chicken, which, like other white meats, contains beta alanine. (I recommend reading the wikipedia article on beta alanine, as well as other sources you'd find with a simple google search).
Personally, I kinda like the "prickly" side effect. IMHO, beta alanine is much less risky than the vasodilators like Noxplode, which, to me, are not something I want to take for any length of time.
It's $39 bucks at bodybuilding.com. Give it a whirl and report back! It's always nice to see the rare case of someone who asks a "has anyone tried XXX" question return to the forums and give back some of the advice they sought earlier.