I was looking for a different PW, and tried the caffeine free NO-Xplode in hopes of having strong pumps for late workouts and still being able to get to sleep. It DOES give you a fairly nice pump, and kinda got me to those extra reps/ sets, but was super lack luster. I didn't like the fizz and foam either. It's been a while since I tried (only tried) the original NO-Xplode, so I can't remember if it was this bad, but this stuff got all frothy just from gently stirring to mix. I was able to sleep though... but I'll scarifice sleep for a better PW.  
 Not great, but if you workout late, you'll get a little extra pump and get to sleep at a reasonable hour.  
 Wasn't really focused  
 Mix and taste are not great  
 pumps were better than nothing

Actually purchase the caffeine free version of NO xplode on accident.. I noticed when I received it in the mail that I had gotten the wrong one.. But decided to keep and try it anyway. I was really surprised that I was a seen such good results on something that didn't even have caffeine. I think this versions probably a lot better for me anyways. I don't think I need all the caffeine. Give it a try and I don't think you be disappointed.