From the 6moon review, they didn't seem all that impress, they said that starting out with a good amp might render the SA redundant:
"However, the sound more than filled the room and the bass for the most part sounded appropriately deep and fat. It just lacked ultimate definition. [For comparison's sake, my reference tube amps don't generate enough current for that low-frequency leading edge into those 10-inch woofers either. However, the 1000-watt into 4-ohm ICEpower amps are truly shocking in that regard. At least in my space, they could well render the addition of the bass amp redundant. The same would probably hold true for a more affordable Bryston or McCormack amp - Ed.]"
"However, the sound more than filled the room and the bass for the most part sounded appropriately deep and fat. It just lacked ultimate definition. [For comparison's sake, my reference tube amps don't generate enough current for that low-frequency leading edge into those 10-inch woofers either. However, the 1000-watt into 4-ohm ICEpower amps are truly shocking in that regard. At least in my space, they could well render the addition of the bass amp redundant. The same would probably hold true for a more affordable Bryston or McCormack amp - Ed.]"