Since it's designed to connect to a speaker-level output, I think that it would work with receivers rated at 100 watts per channel. They'd really be limiting their market otherwise.
Looking at this on the website, I don't see much of a point. I mean, I thought each speaker had its own built-in amplifier, and you would plug in each speaker to a wall outlet on the corresponding side of the room. However, this set has a single amplifier to which both speakers must be connected, so you're going to have wires running across the back of the room anyway. Is this really better than just running wires from the receiver? I guess it would depend on the situation.