i have a strada xb with the same system in mine if fully upgraded and yes they are very fast and has supprisingly good handling they don't come with bearings all round (none in the hubs) the diffs have lasted over 50hours of run time and are still in as good condition as when i got it (over a year ago now) although the diff cases, drive cups, drive shafts, spur and pinion, have to be replaced now and again. and the shock towers are made out of cheese.
yes the ezrun combo will fit in the mt.
it only strips gears if you leave the spur/pinion uncovered (i have made a cover for them) obviously they will go eventually as they are plastic/brass
it runs cool if you gear it right i run 20 tooth pinion 64 tooth spur. that works good for me