I recently purchased two DSC stripped lowers, and built them into complete lowers using J&T Dist. A2 stocks and lower parts kits.
Absolutely no problems. I didn't even have to debur any holes or anything. The finish of the lowers is excellent, with completely smooth surfaces and even finish.
I recommend them highly.
P.S. I have also used RRA, Bushmaster and Colt lowers. On a new build, I would pick either DSC or RRA, with DSC slightly higher on the list than RRA.