The only real downside I've found is that it doesn't allow for standard side saddles, but I knew this going in. It will fit on vent-rib bbls! The design sits nicely and looks pretty good on the Remington 1100. I use my light in an offset mount on the left side rail and the light sits perfectly within reach of my thumb without removing my hand from the forend. There are some huge rail systems out there, but this one is almost minimalistic compared to most of what's out there. It weighs OUNCES, not pounds, so anyone complaining about the added weight can be ignored. The cardboard box it shipped in was heavier. It is, however, well built and sturdy. Just make sure to install the side rails BEFORE attaching it to the shotgun.
Pros: Value, Design, Fit/Finish
Cons: Doesn't allow for standard side saddle devices
This review was written in the old system and had content requirements that are different than reviews written today.