I've recently, in the last week added a front one way to my TT-01... which has a rear locked diff as well running on abs... I can definitely see the good in it... but it can put a damper on other things... for example... REVERSE! ouch... reversing without the 1 way was a breeze, but with the 1 way it's kind of annoying because only the rear wheels spin and the traction with ABS makes it sort of difficult. Problem number 2 isn't really a problem but the brake bias has to be adjusted properly, if you drift at very slow speeds you'll be fine, but i like doing some higher speed drifts and you have to allow the brake to be eased VERY gently because a tad too much and the car will just 180 making you look like a douche.

My biggest problem is the area i run on normally is quite rough, and these drift cars with very limited traction shine on the smoothest possible surface.

All in all though, i'd say I like the extra control added with the front 1 way, but for some people, they may not find the benefit worth it.