I had a Dlask upper and lower, purchased separately from Dlask.
The lower was nice, but I think the overall finishing was nicer on a DPMS lower I had. I also had an issue with a couple uppers not fitting on the Dlask without slight modification.
The upper was good, though I never fired it. Came with a FA carrier, was 14.5" but had a slightly different barrel profile than an M4.
I sold the lower to fund a new ATR billet lower and sold the upper the get an LMT 10.5".