First I'll say I'm not a spectacular wing shooter. I've been bird hunting as much as possible every year for the last 20 years or so. I have only done skeet shooting a handful of times and I usually hit 16-18 out of 25. I really don't practice, I only shoot at living things with a shotgun as God intended. Not trying to be a d-bag shotgunner (Can't stand most of those types at the range.) I put a Burris FF on my shotgun a few years back and it has had no effect on my shooting. I'm still an average shooter. I will say that putting a red dot on my handgun improved my times significantly, which is why I tried it on the shotgun, but there's a big difference. The dot lines up spot on with the fiber optic bead on my gun if my head is like it should be, so it really shouldn't have much effect. Where I think it can help is when I CAN'T get in a good shooting position, such as twisting around in a duck blind, laying on un-even ground, etc. You get in some strange positions that skeet shooters never have to deal with. Even if my head isn't just right, that dot is within view and I know where my shot will go.
I have the FF mount that puts a spacer in the tang area between the receiver and the butt stock, which allows the sight to sit very low. I tried mounting the sight to a pic rail on the shotgun and it wasn't worth a damn. Way too high to comfortably shoot. I think you'll run into this with the MRO.
-Dan