EFI vs Carb'd chinese bikes & Super-moto vs dual sport

Have a quick question before I decide to buy my new bike. (Qingqi 250 Tibetan mastiff/SSR250/Qlink XF250)

Anybody have bad experiences with chinese EFI systems? Fuel pumps or mapping problems?
If I buy the carb'd version of the bike will I still be able to get it registered 100% legally in China?

Also,

Are there any differences between the super-moto and off-road versions of the Qingqi except for the obvious:
Gearing, tyre size/pattern and the rims.
Do they adjust the suspension differently or modify the steering for on-road use.

As far as I'm aware there are not serious problems with EFI systems provided the bike is regularly exported. However some bikes may have a lean condition and have snatchy throttles in first gear, but this isn't limited to Chinese bikes. Also Qingqi would have certainly copied or bought in Suzuki fuel mapping and EFI electronics.

I think all new bikes over 150cc in China must be EFI for emissions reasons. Having a carb bike of 250cc means you have to lie about capacity or have it off-road and unregistered only.

No idea about the differences between the supermoto and off-road versions of the bike.

Qlink?
There is no such thing as a Qlink XF250, I checked to see if Qlinks website is still active? It is and until November 2015, it seems to be registered to an address in Seattle Washington, under a name checking the name reveals this humorous information. Is anyone familiar with the Flintstones?
I am pretty sure Qlink Motors went out of business a couple of years ago.

I believe that the only exported version of the 250 with EFI is sold in the UK under Sinnis, the only model sold in the US is through SSR and has a carburetor. The standard version of the bike is being offer as a HMC also in the UK.