I've had the YBR125 about 8 months now. Have been communting approx 250 miles a week on dual carriageways and NSL roads and completed 6000miles in total. In all that time only problem has been a blown rear bulb. I have the 2008 model, which is fuel injected and has an auto-choke. Starts 1st time, including all through the winter, and cruises at 60mph without a headwind. Had 75mph with a tailwind.
I've commuted through rain and shine (though not snow) and the bike hasn't put a foot wrong with 100+mpg.
Only negatives are short mirror stalks, although when set up right you can seen behind clearly enough, and stock tyres don't inspire complete confidence. They've never let me down, but equally I've never felt tempted to push them.
Have used FS365 and then ACF-50 over winter, and bike has come through with just small amount of corrosion on the exhaust. Looks practically brand new.
As a learner and cheap commuter the bike is highly recomended. The number of cheap Chinese bikes with fewer miles and covered in rust that I've seen make me feel the YBR is a worthwile investment. Highly recommended.