We are using an Outlaw RR2150 receiver to drive two sets of Klipsch heritage speakers in our great room. We use the receiver to power a pair of Klipschorns solely for 2 channel music, and also use it to power a pair of Quartets for TV/DVD viewing. Both configurations produce excellent results and we are very satisfied.
Over the years we have previously owned and used a Marantz 2270 and later a Pioneer SX-1080 reveiver. The Outlaw RR2150 receiver's speaker-driving characteristics seem to be similar to the Marantz and Pioneer in several respects. All three receivers produce high quality, warm, non-harsh stereo music while providing sufficient amplifier overhead to shake the walls with dynamic movie soundtracks when desired.
As always, the size of your particular listening room and the amount of sound absorbing furnishings you place in it will affect your results.
Of all the features the RR2150 provides, our two favorites are the quality and power of the amplifier (which are really excellent) and the USB line-in port (which we use to connect our music server computer).
While no receiver is perfect, the Outlaw RR2150 meets all of our current needs well and we would highly recommend it.
Rich