I had a look at an ACR in a gun store in Minot on the weekend while I was shopping south of the border.
My initial impression was that it felt like a SL8 with slightly different furniture. It was slightly lighter but it had the same "feel"... it is hard to quantify. The fit and finish was very nice and the one thing that stood out was how smoothly the charging handle slid back.
I was already drooling when I handed the rifle back, and the guy behind the counter says "check this out!" and he throws a suppressor on the the barrel. I wanted it so badly... FYI the price was $2800. It was on display with some magpul sights and an Eotech, and I'm not sure what accessories were included with that price.
FYI, if you are ever in Minot,ND you have to check out the sportsmans loft. They had a Kriss, PS90, FS2000, assorted AUGs, countless ARs and rack after rack of assorted AKs, FALS, etc. The store is pretty much dedicated to black/military derived firearms. The upper floor is set up like a museum with a fantastic collection of WW2 firearms. Very friendly staff and they were happy to let the Canadian visitors handle the assorted unobtainable firearms.