Hey there, I've had some lemons in the past with Mosfets, but I assure you, when you get a good one- they are beautiful.
As for computerized Fets, I run a Gate MERF 3.2. Programmable burst (1-12), and compatible with a microswitch. It's the easiest installing mosfet I've ever dealt with.
The fets have faster trigger response, (in this case) thermal resetting fuse, programmable bursts, active breaking, and a plethora of other features. I'd totally recommend getting it.
http://www.airsoftstore.ca/index.php...roducts_id=135