Not sure I would recommend an 1100 unless you come across a deal, or you like keeping lots of spare parts. I got one because my competition-oriented smith recommended it, but he is all Benelli now. If an 1100 out performs a Benelli, there is something seriously wrong with the Benelli, either ammo, or useage (its inertial system has some limitations).
Before buying a gun, figure out exactly which game, because there are some rules differences. USPSA says you cannot
load more than 8 + 1 at start in the gun (10+1 in Open), but if it
holds more, no problem. Some matches (Fort Benning and Larue, for example) say the gun cannot hold more than 8 in the magazine. Not sure about IPSC Standard.
Saigas get used some; their supporters are dedicated. They get modified more than your average shotgun. And it looks like there is some hate for them as well. For instance, without a mag change, it is hard for Saigas to swap ammo mid run, like when a match requires a slug in the middle of a bunch of birdshot targets. And at the Larue match there was a rule: "You may not
load a slug until one birdshot has been fired" so the tactic of pre-loading a mag with a slug in a known position could not be used. But I still want one.
Lee