These subs are great. I've used them for a few gigs and they can take everything my CE4000 can throw at them. They sound good, really thump with nice tight bass (thanks to the dual 15 rather than single 18 ) The frequency response is good and the effiency is the best I've seen in this price range. They really match up to the tops nicely.
The cabs are birch plywood - solid as a rock but easily managable for one person, nice tiltback casters for wheeling them around.
I would add another pair of handles closer to the top on the sides of the cab, the low handles are great when being lifted by two people, but not so good when by yourself.