I've tried basically all supplements, and NO-Explode is the best by far. All of the Gaspari products make me bloated. Cellmass may work, but it didnt work very well for me.
I swear by NO-Explode. You should put on at least 5-7 pounds within a month. Just drink lots of water and train hard.
Then again, every body is different, but there's probably a reason why NO-Exlode is so popular.....