No experience with these yet. I have some of these on order and will report back when they arrive.
My experience with other companies that sell blems is that the accuracy is not the same. Out of 10 shots you will get 1 or 2 small flyers. I typically run blems in my precision AR and still get sub MOA performance at 100 yards. Where things really start to fall apart is at longer ranges as the BC varies more from bullet to bullet.