I've installed three so far (as well as some 3 round burst unit I was given, non programmable but works very well, even if it's only 2 round burst and full auto, which I actually like a lot better) in different guns, and installation skill required ranges from intermediate (say full stock gun, battery in the back) to very advanced (battery bag on stock, TM unit in front foregrip).
Overall hooking it up is easy, but wire management is where the real challenges lie, as well as being able to work on your mechbox in the future (aka. means of disconnecting the wires).
Is a VERY capable unit, lots of range in adjustments.
Syn, it's doesn't get hot, you literally take out your wiring harness and install the TM, usually it's said to replace the fuse with the unit, largely because there has to be a place to put the unit, and it's about the same size as the fuseholder. And once yo install it and hook it up, it *should* be able to fire burst as a default (according to Don), but with my first, I had to program it to burst mode to get it to work.
Oh, I'm going to be helping Don out, I'll be populating most of the TM circuit boards in the future. Populating meaning soldering the components onto the boards.
