Tippmann Pro-Carb, Psycho-B drop forward, D-feed, Bob Long X Chamber, Lapco SS trigger and cocking knob, APP grip frame, Airtipps RVA, SmartParts All American barrel, Madman springs. Also use an Epic from Insight Component Engineering (ICE) as is.
The sound activation. It is activated whenever you pull the trigger. New Impeller.
None noted to date.
This is a good inexpensive electronic hopper for those wanting to upgrade to one. The shell appears thin at first, but it is flexible and I would be very surprised to have it break. (I say that because it looks like a Viewloader shell and they had some problems awhile back.) The sound activation really works! You push the button, the red LED flashes, and you go play. Every time you shoot the hopper agitates for half a second. It turns off in about 30 minutes of inactivity. It has the X board and a vortex impeller installed when you buy it. I paid $52.00 locally which if you figure shipping is about as cheap as I could have gotten it from an on line store. It doesn't have the issues with the eye that the revvy had. It does agitate (like when you fire) when you open and close the hopper but who cares? It also gives you a low battery warning with the LED. I had no failures to feed with it. I can't say however what max rate of fire it will support because I don't require that fast of a feed rate. I have no experience with Empire so I cannot comment on their customer service and support.
I say you can't go wrong with this loader. It's pretty simple (like a revvy), reliable, and most important affordable. I will probably buy another one.