I have a pair of Mac 611 monoblocks driving B&W 802D's that sound wonderful. They replaced eight parallel-series connected Harmon Kardon Citation II tube amps that output over 500 watts/channel at 0,1% THD into those same 'speakers.
Sound was excellent from the tube amps, too, but replacing $45 output tubes and 2.5 kW power consumption, not to mention lugging a 60-pound tube amp upstairs to my test bench at my age after every replacement necessitated the change.