I have not yet recieved mine. I have only placed a pre-order for a frame with an m600. They're supposed to start shipping in July.

I ordered one on aliexpress about a month ago to build up for my girlfriend (in pink of course). I'm still waiting for it to ship. I've built up 2 BXT hardrail frames without much drama.

It's going to be really expensive and a headache sourcing a shimano motor for a frame build. The dengfu e10 or light carbon frame are probably the best options for an enduro style frame from China. I was going to go this route until I discovered the VMG Typhon. The Typhon is by far the best option for a frame only build. It's a little bit more expensive and they're based out of Australia.  It uses a bafang motor and the geometry is very modern.

Edit: the Typhon is a mullet design. 29er front 27.5 rear.