I've got the #4 Quangsheng (UK version from same manufacturer).
It's a very nice plane, but heavy - which is either a plus or minus depending on your school of thought.
The iron just was flat and just needed a quick hone out of the box, so don't know if Rich was unlucky or I was lucky.
Never known anyone who adjusts the frog on a regular basis, so the bedrock v bailey argument passed me by.
Personally I reckon it's nicely built but a bit heavy, got a spokeshave and block plane from the same manufacturer, but wouldn't get anything bigger than the 4.
Edit - and a small router and small plough plane now I think about it, although I'm not that keen on the plough, I prefer the wooden ones by a fair distance.