Have you done any efficiency tests on them yet? I know the Bosch one was very low efficiency, i think less than 75% (its on one of the data sheets on
www.usfirst.org). Of course i dont know how efficient a typical FIRST home made gearbox is, so its hard to compare. I just have to find some reason to build a shiny new gearbox... Howabout weight? tell me it weighs a ton. (yeah, i know, its gotta be pretty light....)