Well, what I know of them is, they are Canadian, make quite a few of their own parts.
That's always a plus.
They use generic AR parts for the rest like everybody else, so that suggest mil-spec compatibility.
They have been known to have sketch QC in the past, but I have not heard any complaints recently. Most I hear about them is that they make quality stuff.
I'm leaning towards a Dlask lower myself for my recent AR build.
I don't think I'd hesitate to buy one if I was on the market for a complete gun, but I'm new to AR's.
The only thing I've heard bad about them, is that they are busy busy people, so sometimes getting hold of them to place your order is difficult, but otherwise good service and workmanship when you do.