I bought a JC-5 a few months ago after auditioning the JC-1. I found the two amps to have a very similar sonic signature, but the JC-5 was slightly cleaner sounding. The speakers I was using were fairly easy to drive, so the added current capability of the JC-1 didn't come into play. Both amps could easily drive the speakers to high volumes.
I've owned a dozen or so fairly high end SS amps from Levinson, Krell, Pass and Bryston over the years, and I'd say the JC-5 is easily in the same class or better. However, the other SS amps are not recent models - mostly from the 80's and 90's.
Based on my experience with the JC-5, I would expect the JC-1+ will be an outstanding amp, particularly for speakers that are more challenging to drive and need the high current capabilities.
I've owned a dozen or so fairly high end SS amps from Levinson, Krell, Pass and Bryston over the years, and I'd say the JC-5 is easily in the same class or better. However, the other SS amps are not recent models - mostly from the 80's and 90's.
Based on my experience with the JC-5, I would expect the JC-1+ will be an outstanding amp, particularly for speakers that are more challenging to drive and need the high current capabilities.