It's an awesome upgrade from the stock trigger, has the ability to shoot in semi, burst and full-auto.
Although it may be a wicked upgrade, it also has some major flaws:
1) It's not waterproof, so if you're like me and play in a light mist or in a wet area, then the grip could get wet and short out.
2) Changing the battery isn't nearly as easy as it is with a Tippmann egrip. You have to unscrew the rubber grip, take the battery out, put a new one in, then screw the grip back into place making sure the wires aren't showing. It's very time consuming.
Overall, it's a great upgrade to have, especially if you're playing speedball.
A definite upgrade if you're looking for a speedball upgrade, or if you just don't like a regular semi. I recommend this to anyone who gets a BT.