I've had my SL1 for just shy of two months, and definitely like it. While it would be nice to have tool-less adjustment, it's a small compromise considering everything else about it. I especially like the ear shape and placement since it matches up perfectly with my KAC rear sight.

I agree with rob_s regarding handguard length. I run my SL1 nearly flush with the end of my handguard so I can reach it easily. Even with 4" of barrel/flash hider past the lens the shadow isn't noticeable.