Hi Dave, yes I love my S5, at least better than my previous speakers. What I appreciate most is its bass definition and coherence with the midrange. In my case the closed enclosures seemed to make them more tolerant to non-optimal placement. My listening room, approx. 16' x 18' with opening at the rear to another area, would not allow for much flexibilities.
My front consists of a Rockport Capella air-bearing tt/arm with Benz Ruby, and a Lumin streamer for digital. I have driven the S5 with 3 amps: ASR Emitter II, Devialet 400, Vitus RI-100. They are all enjoyable and my preference is in that order. Previously I thought amps with slightly dark tonality, like the ASR, would be more suitable, until I heard the Devialet. It is more sunny yet not lean with great resolution and ambience. I still prefer the ASR overall but the Devialet works wonders with the bass.