Tippmann Custom Pro
Stock 11" Werks Barrel (NEEDS TO BE UPGRADED)
Doesn't use too much extra CO2
Doesn't work when CO2 is low
Need t-screw to run Cyclone Feed
I think that the response trigger is probably the best upgrade for your tippmann. I love it because it is an inexpensive upgrade to make your gun full auto. For one, you don't have to use batteries and therefore never worry about changing batteries or your gun not performing. Two, you don't have to spend 70 dollars on a compressed air tank because the gun isn't electronic and you can still use CO2. And three, it is cheaper than the e-grip. The response trigger is bad in the perspective that when your tank is low the gun only fires semi-auto because there isn't enough pressure for the trigger valve to work. But you can always put on another CO2 tank. You can buy like 3 CO2 tanks for the price of one compressed air tank and get way more playing time with this upgrade as opposed to the e-grip. I also didn't like having to call tippmann for the t-screw. They should just include the t-screw when you buy the rt. But once you get it, everything is worth it. I give the response trigger a 10 because all of the flaws are minor and do not effect its performance. It works better than it is supposed to. It is rated for 15 bps and I have mine doing 19 bps with the cyclone feed so I don't chop!
I reccomend that you purchase the response trigger over the e-grip for all the reasons listed above. It works beautifally and makes your tippmann ten times better. Buy it and you wont regret it when you mow down your friends at 15-20bps!