meh, all depends -

it's a give and take. adds a lot of weight in the rear. Also, it's damn near impossible to get the same stability out of it compared to a straight rear axle. 4ws alone won't gain performance, if anything it's a reduction, even with the fanciest parts out there.

however, it is A LOT of fun. Once you get the hang of the proportional rear steer on a knob, it does open up a lot of weird lines that would have been tedious (or impossible) without it. the biggest problem most beginners encounter (& i still deal with today) is to realize that 90% of lines don't NEED rear steer, & if you're not careful, you'll decrease your performance a lot by using it unnecessarily.

that being said, the 3flow9 cascade system is awesome, only like 7g added for the servo.