Buddy has one and loves the ease of use. The bag is off the paint although I don't own it, only seen it lightly packed. I would assume it stays off the paint due to the solid base plate on the bag itself. My only concern with this bag, and it's just me being a worrier, is that anything heavy in front or behind the latch may exert pressure forcing a release. My pal swears he has tested this scenario and never had a glitch. Nice touch that he can move it forward/back by adjusting the mounting plate on the bag itself (which I suppose would cure any uneven loading issues.)
I thought about getting one, but I really don't like the look of the tank when you aren't using the bag and for me (on my other rides) that is over half the time. If I find myself doing longer and longer trips on the feejr I will strongly consider this case.