I like them! I haven't shot any deer with them yet, but so far 3 groundhogs, a squirrel, and a coon have fallen to my grizzly broadheads.
I used to use my KME sharpener and get they super crazy sharp, but the process took awhile and I started getting tired of spending so much time sharpening them.
I now use a file to raise a burr, than use a sharpening steel to work the burr back and forth until it is sharp. They are not quite as sharp as the KME, but the edge is more durable now and it will still shave hair easily...works for me!
I don't think you can go wrong with the grizzly single bevels. I have tried lots of different broadheads and have settled on grizzlies as my broadhead of choice. Enjoy SS