I've always liked the ICAN frames, and have only heard good things about them...but the price...
Apparently the cream of the crop frames coming out of China these days are the SEKA frames. But you'd be paying about 50% of the top-tier branded frames (Look, Pinarello, S-Works, etc) as opposed to the hyper-competitive pricing offered by Deng-Fu, Velobuild, Tantan, Carbonda, etc.
Some extra intel on Velobuild.
Of all the manufacturers involved, I believe they price closest to their minimum required margin than others.
I have reached out to Chris re: B2B purchasing. The price per frame was only $15 lower than list price.
Whereas, a higher-end manufacturer, such as ICAN, the price can be $100-200 cheaper than their advertised retail rate.
(If anyone is curious, I am kicking around the idea of building a small batch of 250-350W Gravel eBikes, using their new eBike GF-002 frame)