I got a Core15 DI and I am very happy with it. Fit and finish is nice rifle is solid everything fits great. For an inexpensive rifle its great and its not made in China.
If you hate the piston design don't buy it. Just do what I did buy the DI version. Wanstalls where I bought my rifle said there will be more distributors in Canada shortly, and if there are that's great new cause you would most likely get warranty help through the dealer. As for Warranties with US made equipment, I've seen posts about other Major US firms that has issues doing Warranties in Canada.
But for a 1100 dollar rifle I will take that chance, I could also got a norinco for 700 and have no warranty at all, and get stuck with replacing the lower.
Lets face it, its an AR you can easily Farkle it because so many manufacturers make parts forth em.
I have put about 300 rounds through mine I had couple jam issues and that is because I didn't tap the mag well enough, stupid short mag is not even visible in the mag well. This issue is solved by using GP Tactical bargain LAR mags which feed great.
As for accuracy, its shoots well enough for me 100 yards all within 1" inch groupings, even with my scope being misaligned and twisted/slanted. I am hand gun shooter so yeah this rifle thing is new to me. I shot .223 out of it and 556(Norinco)