Never taken beta alanine except for in results. I have to say that it definitely worked though.
The first time I tried it is when I bought Phosphagen Elite, on sale.
The last supplement I used with Beta-Alanine in it was NaNO Vapor. That is some good stuff (I particularly like the Blue Raspberry one). Granted, I haven't used it in over a year (and won't do so, UNTIL GNC marks the price down again). But, of the supplements I've used with BA in it, NaNO Vapor was the best.