Hi Jimspov
I am currently using a pair of REL STRATA IIIs. Adding the first one was a significant improvement in midrange depth and ease along with the added bass. I find less is more for seamless/coherent integration but there are many settings to get things balanced to your particular room and tastes. I set mine up with a spectrum analyzer with an almost flat response at the listening position.
Adding the second brought my wife's attention as to what was going on as she heard the change from an adjacent room. The improvement in every conceivable parameter is readily apparent from dynamics, timbres, clarity, more realistic texture and body to voice and instruments, soundstaging, depth .....you get the idea. And as for bass, well it improves on clarity, smoothness and balance really well worth consideration IMHO. The system plays very big and dynamic with all genres of music including orchestral/choral and rock and with small scale very intimate which the Decapo's excel quite well on their own. I am using a 90 watt Quicksilver tube amp in this setup, it certainly doesn't hurt in my medium size room for the variety of music I listen to.