might I add that Tamiya have outdone themselves with the TB EVO V, the new shaft layout where one end of the shaft is connected to the input cup while the other end is free to slide backwards and forwards is a great idea. Notice how the open cup has quite a long groove for the dogbone end of the driveshaft, allowing the shaft to absorb impact while still staying in the input cup and keeping constant drive. Seems Tamiya have read up on feedback on their EVO III (bevel gears stripping were the evo 3's BIGGEST problem) and integrated the EVO IV's dogbone shaft design for a revolutionary shaft design.
The choice of having aluminium diff/front one-way AND bevel gears would make for an absolute bullet-proof drivetrain. If other shaft cars had the aluminium gears and bevels I'd think they would break some teeth or grind in big impacts, but thanks to the new 'drive-train saving' shaft layout this wouldn't be a problem in the EVO V.
I'd say out of all the shafters, this one will definately be on top as of the release and I can't wait till I get the chance to grab myself one of these beauties.