Here is a review of the SW-311.
It looks as if the SW-310 and SW-311 have a lot in common.
MSRP goes from $1050 to $1600, but weight only goes from 35 to 37 pounds, so I bet they share the same cabinet and driver/radiators.
It is clear that the SW-311 adds ARCII room correction EQ and another 100W of power.
It is a reach to say they are the same for performance, but I'd say you can bet the SW-310 would not out perform the SW-311. The SW-311 reaches down to ~30Hz then drops like a rock. With 100 less watts, the 310 probably drops out sooner.
In any case, I'd bet general comments on build, WAF, and even conclusive remarks on where this sub might be best suited are mostly applicable for evaluating the 310.
For performance, I think two Jamos are hard to beat. For appearance and idiot-proofing, the Klipsch may be better.
Klipsch SW-311 Subwoofer Review — Reviews and News from Audioholics