I have one and like it for my needs, but am probably not the best judge of quality as I only had an SJ4000 to compare with, it is slightly better, and only use it in 720p30 mode.
The sharpness is a little disappointing though, in addition to being obvious that it is not stabilized from the way everything bounces around. But my bike could be a lot smoother so that probably affects it. You have to be pretty close to someone to be able to read a number plate, and at motorway speeds even then it can be difficult. Maybe a higher mode will make a difference.
The main reason I bought it though was also for the battery, because at best the SJ4000 batteries only last up to two hours. On 350 mile plus days out having to regularly stop and change it was a hassle. But with the optional extended life battery for the Drift I can go on a long day out and never have to worry about it.
Whilst it is fine for my needs, but I am not sure I would recommend it as a commuter camera in case of accidents, where clear number plates are the priority, or for making fancy videos to share where stabilization matters. But, again, I use 720p mode is so I can download everything after without it taking too much disk space. Maybe 1080p or 60 fps will make a difference for the former. Also I have medium bit rate setting so that could be improved too.
But anyway, a few random screen shots from recent trips, which are more disappointing than I expected. Especially the Asda petrol station one, as I was going under 30mph then so would have expected the text to be clearer.