is there any difference in the quality of shifting compared to di2?

Added photos of the R088 frameset. A few quick observations. The chain stays and seat stays are really thin. The bottom bracket shell is tiny. The fork spacing is wide. The tire clearance for this frame is spec'ed for 32c, but the rear triangle area looks small, so it'll probably be a tight fit. I forgot to take photos of the head tube, but I put bearings on each end, and the fit is snug with no play. I didn't have much faith in SPCycle's paint work and went with UD glossy since it's easy to touch up, but I prefer it over painted black.

In a lot of ways it's just a more refined version of the TFSA SL6 clone I'm planning to replace. I don't have those wire cameras, but from what I could peak from the BB shell and head tube, the EPS molding does look smooth. Also it looks similar to the SL8 knock-offs minus the ass sniffer head tube. I'm curious to see how stiff this frame will be, it almost looks anorexic. If I was a big boy, I might be scared of riding this. Overall, I think this will be a quick parts swap from my older frame. I'll see if I can finish the build this this week. 

I don't quite understand this big hole in the bb area of the chainstay. The stress concentration in such a place is not very good, especially with such a big hole. Spcycle had frames that broke repeatedly because of the strange design.