I have assembled many kits. The Ryft is one of the best kits I have ever assembled. Are you buying the RTR? If so, you need a sway bar for it. It has severe torque twist on the RTR. Even on the kit, which comes with the sway bar, it is still noticeable.
If buying the kit, pay attention to the shift fork if going with the 2-speed option. It doesn't show in the manual, but it only goes in one way. The shift arm screws into it, and needs to be screwed in on the side of the fork with the counterbore in it.
As for driving, the Ryft is really narrow and doesn't stay on its feet very well. It's really only designed for short bursts of speed up steep terrain. It does not drive well on flat surfaces at speed. It takes some getting used to.