I have my X2 now 5k km and its running well. But as u can see from my postings i have modified a number of things.
(Some are of course not necessary, but nice to have)
IMO the necessary mods cost u all in all 1000RMB.

In Thailand I have tried a CRF 250L and it is still another level over the X2, but u can't get it legal in China. So I went for the X2 ( about half price of a illegal CRF)

If I could get a legal CRF I would pay the difference.
Consider that between the CRF engine and the NX250 copy of the X2 lay about 20years