My experience with mono amps was with VTL on the tube side and ATI on the solid state side.. I tried the VTL ST-150 on my Maggies then switched to the MB250's. The ATI amps were the 15O WPC models. Those I tried stereo then bridged the two pair for mono operation. In both cases I heard better soundstage depth and separation. The imaging was better defined and just seemed to be more stable.
