Just had a play with 6 AV12's in a sub (same idea as this sub, and sorry but I cant help but mess with numbers). With 6000 watts input could be made for about 2k max. It would need a cabinet of about 120 litres and would peak at 133 hz (probably 139 in room). It'd manage 108 at 10hz and still be well within xmax. All for half the price, but given the fact a commercial sub would normally be 4 times our build cost, and this Paradigm isnt far behind thats makes it actually seem pretty cheap for the sub on offer in real terms.
I'm not sure the B&W would be able to compete with that one and cant see why anyone would choose it over this based on specs alone, eq or no eq. A subjective comparison based purely on sound quality would probably be of more benefit than a performance shootout I reckon. It certainly looks a fantastic peice of kit!
I'm quite happy I currently get a peak of about 124db with my own sub (upto 130 in room).