I just bought last night a pair of Mani Signatures in perfect condition (there beautiful) and have to sadly say there too big for my room and overloading (dam-n it). The person who I bought them from let me go over to his house for a listen and some bourbon, the room was smaller than mine. He also had a pair of Model One sig that we swapped out in his room and the Model One's were better suited than the Mani's in his room & system. He didn't have nearly the power or room size for the mani's.
The Mani's sound incredible as long as the music didn't overload my room, soundstage, transients, speed, bass, stage depth is awesome. I feel very lucky to have these in my home; There world class. I'm listening to them now and I keep having to look to my far left & right of the room because I hear sounds but then realize they are transients of music coming from the speakers.
You do need massive amounts of clean juice. He had an integrated Accuphase E-250 that wasn't nearly powerful enough although it did sound fantastic with certain limited pieces of music. I have a A5.5 and feel I need better power to get the most out of the Mani's
I hate to say it but I would do a straight trade with someone for a pair of nice Totem "The One's" due to my room size.