OK, yeah, I'm impressed!
Low recoil can be had multiple ways: cooler handloads or a recoil buffer. I presume the E2 has the buffer (like an AR-15 or similar).
I'd be surprised if the Remmy 1100 couldn't cycle as fast, but there's no recoil buffer (apart from the semi-auto action itself) so your shoulder might protest after a couple dozen very fast rounds.
Surprisingly, the cost is of the E2 is about the same as a new 1100 (which doesn't have the extended mag tube). I'm looking to upgrade from an 870 to an 1100. Maybe I'll go for one of these instead.