I've been cyclocommuting on the S3X daily over the past two months. So far I love the thing. I can't comment on durability yet, maybe after a year's worth of riding. I don't skid, and I don't do track stands.

The only hiccup I had was an uphill start from a dead stop. I shifted into 2nd while stopped, and when I put the pressure on to move through the intersection, I went into one the false neutrals. Luckily I didn't crack the crotch or fall over. My foot disengaged from the pedal and went straight to the pavement. In retrospect I a) failed to make sure I heard/felt two shifting clicks, and b) I should have shifted while still moving or spun the wheel at the stop to make sure 2nd was properly engaged.

It's performing as I hoped it would, so far.