I do have several sets, both in my posession and on order. Some are built, most are projects waiting for future funding allocation. Wouldn't be suprised if I am one of, if not the largest sole end user purchaser with my name on approx 3.4% of total production from run 1 and 2.
As for how I feel about the various design cues:
MAGWELL - I like the flared magwell for 3 gun etc, and I dont find it to be very sharp at all, I was actually admiring the other day how ATRS actually cleaned up all the sharp edges and corners, its nothing like my BCL102's magwell, it is litterally an overly exaggerated sharp edge with no bevelling, enough so that one could probably say that is the most dangerous part of that rifle. Haha. That said I wouldn't mind a more subdued flare, especially for things like my C7 clone.
RECESSED PIN - The whole modern series has had this design, it provides a clean look on the push side while leaving you a gap to get hooked into to pull it out on the pull side. My personal thoughts on this are that I would prefer it sit flush and stick out the other side, as often I find I need to push the pin to get it started and I don't always have a bullet laying around to do that.
TRIGGER GUARD - I do like the design, but at the same time I hate having the choice made for me, and once again doesn't really fit my C7 clone, but again, big whoop.

�� It does keep one from having the trigger guard gap from biting into your finger which in the end is worth it on 80% of my builds.
MAG RELEASE FENCE - This was one of the things I agree with most, it is rather large and over baring, a nice beveled edge all the way around would be perfect. That said I am glad they left the material as I plan to pick up several of their MV ambi bolt releases, and mill them into some of my sets. It was in my opinion one of the best features on the MH, MV, and BCL102 G2, as I hate the idea of a BAD lever style bolt release.
An unmentioned here issue is that G1 uppers have a sharp forward edge that needs some bevelling to stop square mags (mostly steel lipped ones, Lancer) from hanging up on during insertion. I believe this will be OEM resolved on all future runs, and G1 owners can take theirs in for a update.
Honestly, I am thoroughly impressed overall with the product and I may order a couple more lowers yet in order to keep me busy until C71 is repealed and business can go on like normal yet again.