That anyone would not be able to figure out that OP was asking for comparisons of the JC1s he has had for 10 years to the JC1+ that has been out for only 4 years is sad.
Parasound Halo JC 1+
I currently have Parasound JC 1+ monoblock amps that I’ve had for 10 years and have loved every minute with them for all the reasons you commonly read. For my ears, they’re awesome.
I’m seriously thinking about trading them in for the new JC 1+ model. The reviews have been great and my dealer swears by them. Does anyone have the JC 1+ and, if so, what do you think?