This is probably the single funnest upgrade you can get for your Tippmann. The Flatline barrel comes in a very close second, but kicking into full-auto when you get into a tough spot, or when you want to light up a bunker for covering fire for a teammate's push - it's a powerful, addictive feeling.
The price is great.
I, and others who have posted to Tippmann's forums, have had some problems with the gun not re-cocking after every burst. The consensus seems to be that, to get the best use of this trigger, you need
1) N2 (or an expansion chamber with CO2)
2) 12v agitated hopper.
Not too big of a deal, but it was hard to figure out what was causing the problems. A "how-to" or FAQ from Tippmann on how to get the best use of
this trigger would have saved us a lot of research and surveying on what was causing the non-recocking problem.
And you will use more paint. I suggest that if you get this, use it sparingly in the field, and only when you really need to. Not just because of the paint use - but also because we don't want Tippmann owners to get reps for being "spray and pray" players! :^)
In conclusion... I kinda wish no-one else would buy this upgrade, it gives those of us that already have it an advantage :^)
Be prepared to get some attention at the chrono before the game when people start hearing a Tippmann running in full auto bursts!