Overall I thought the fit and finish were outstanding. Zero slop in the car but yet the steering and suspension moved freely. Like everyone else has stated the manual is borderline useless
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I wish I saw the build guide Xpress put on their website before the build, some nice tips there. I had a couple minor issues: I did not see the notch in the gear diff before assembly and almost deformed the gear a bit. And the only truly frustrating part of the build for me was the turnbuckle/ball cup setup. This was more due to the manual than anything else. Calling all of the ball cups short was not helpful.
Very impressed with the quality of the car, ordering some electronics soon. Look forward to running it.
Build guide:
RC Xpress Blog - Xpresso K1 K-Chassis Build Guide