@tswisla While I agree that SHL5+ can benefit from high-powered amps, you'd be surprised how well they work with my Qualiton amp. Just for reference, I have tried the speakers with Luxman 590AXII (owned), Hegel H390 (extended home audition), Kinki EX-M1(owned), Naim Supernait 3 (home audition), VTL IT-85 (owned), ARC GSi75 (owned), and Sim Audio Moon 340i (home audition). So hopefully you can see that I've been around :)
I understand that watts are watts, yet for some reason the 50 tube class A watts seem to go a lot further than the typical A/B watts. Yes, you do give up the tight and impactful bass a little, but what you gain in soundstaging, midrange, air, palpability, and the holographic/3D sound is worth every penny. Anyways, the SHL5+ sounded (to my ears of course) the best with the a50i once I replaced KT-120s with 150s, which presumably is giving 60 watts now. I'm sure the speakers excel in many areas with big iron SS amps, but for my tastes the a50i was perfect with SHL5+.
Now having said that, it is struggling a little bit with the JA Perspective2's. I've been listening to the Josephs since Friday and will share my impressions soon.