Yup, I've got one, imabmwnut. I'm very happy with mine. Shoots straighter than the "loose nut behind the trigger", if ya know-what-I-mean...
AND it's easy to clean afterwards. The piston system is nice for that. I love my ARs, but cleaning them is a bit more involved than with a short-stroke piston like what is used on the SL-8.
What optics do you use on your SL-8? And at what distance?