I don't remember seing them in this forum yet.
But they website does not seem to respond, so it starts badly.
There are many builders and vendors.
Remember that in China when you are the best of 1,000,000 at something, there are 1,000 others like you
xmiplay.com and
xmcarbonspeed.com are the historical vendors of this forum, except some rare glitches, they are the most reliable, especially Peter from the later one.
But then someone brave enough bought a first frame at
workswellbikes.com because he liked the frame.
And it appears, they are very reliable too, and now many buy or consider buying frames there too.
All this to say, that if you feel brave and like a particular bike model, try it, and report your experience here.
Aliexpress has a good track record of resolving disputes when they occur.
Or if you are more conservative, just buy with a 99% confidence from the sites above
