the fasta is activated by a small peice of thin brown plastic that looks like film. it hangs into the feedneck and when a ball hits it, the motor spins. It is a very effective method.
i can make a drop test vid if you like.
I like the fasta but id probably get the egg.
p.s. i just found a reloader B w/ rip drive on ebay stores, buy it now for $70! http://cgi.ebay.com/Reloader-B-Paintball-Loader-Halo-Rip-Drive-Odyssey_W0QQitemZ330110204266QQihZ014QQcategoryZ71 157QQtcZphotoQQcmdZViewItem