I tried Pump-Tech by MuscleTech & didn't notice anything.
If you're looking for a good website to get supps from try
Netrition.com They have reasonable prices & I've never had a complaint with their service.
NO supps make me feel GREAT. I tried a really cheap product first (Dymatize NOV) and the pumps were unreal, I thought I was going to explode. Then I tried No-xplode, it was allright, but the NOV gave better pumps for less money. I don't know if NO supps really lead to any direct gains, but the motivation I got from sick pumps was incredible, and drove me to work that much harder. IMO, the gains form NO are most likely due to you being able, or wanting, to work out harder.
If you are gonna try one, be sure to drink a ton of water, it will make all the difference in your pumps. NOV is only like 25 bucks at BB.com, its worth a try.