||This G&P 8mm Gearbox is great. I got mine some time ago, and weighed it hand in hand with my previous (broken) JG stock gearbox. It weighed only slightly more. The internals are awesome. Half metal piston teeth (I believe 7 teeth), Shimmed gears, thick wiring (no tearing for me!). The 8mm bearing make these gears really spin! I went from approx. 25 BBPS, to about 30 BBPS both using a 9.6V 1600mAh nunchuck battery. Only downside to this gearbox is the motor wiring. First off, the plugs aren't normal plugs, they're circle screw plugs, which means you will need to buy a new motor. I got the Matrix 3000 Turbo (High Speed for me). Also, the plugs are slightly too small for these motors screws, so you'll have to drill the hole a little bigger.
Strong metal gears
spare parts (motor plugs, wire covers)
My gearbox came really locked up (I got a bad egg, don't let this prevent you from buying this gearbox!).
4/5 If there were different sized plugs, or at least normal plug-in plugs, this would be much nicer. All in all, buy this gearbox.
Rating: [4 of 5 Stars!]