I love this monster. It sounds great. The now defunct Basson Sound company did itself no favors by saying it needed a tremendous amount of power to run it. It powers up the same as my other 810's. The comments about how inefficient and power hungry it is are untrue. It will handle a lot of power, but it is not a requirement.
Don't believe the people that are echoing what they have been told. Read reviews from people that actually own one.
As a training aid it is unmatched. An Ampeg fridge feels light after moving this around. Yes, I liked it so much I bought a second one.