Remington's two autoloading shotguns are the models 1100 and 11-87. The primary difference, so far as I know, is that the 11-87 has a 3" chamber, whereas the older 1100 has only a 2.75" chamber.
That said, I've heard many old time shotgunners on the internet insist that the 1100 is more reliable, less troublesome, or less ammo-finicky than the 11-87. Remington makes a Police version of the 11-87, but this gun doesn't seem to be nearly as popular (amongst semiauto fighting shotguns) as the Benelli, and many insist that the FN SLP (which is nothing but a Winchester Super-X variant, or as George Hill described it, a goth Browning Gold Hunter; they're basically the same gun) is a better shotgun.
So what's the skinny? Is the 11-87 not as reliable as the Benelli or the FN? Is the Remington 1100 a better practical service shotgun than the 11-87? I will say I don't really like the control layout; the location of the bolt release button is much less intuitive than it is on other designs.