My UL SLG has been very troublesome for most of the time I've owned it. I've had to make several minor, but irritating modifications to keep it running over the last year. See my full review here: http://www.pbnation.com/reviews/user...ultralight_slg
That said, when the gun does work it works great. I played a scenario game with it last weekend and it worked perfectly, so maybe I've worked out all the kinks with it.
PS: Accuracy isn't determined by your gun- it's mostly determined by your ability to aim and your paint-to-barrel match. The little bit of accuracy the gun contributes is in a steady velocity rate, and in that respect my SLG has been very good. I choronoed it exactly once when I first bought it and haven't had to adjust it since. With a well-matched barrel it's been +-5 fps.