Well the JC-40 may not last long.
It sounds really damn good for cleans, the chorus is amazing, and the reverb is just perfectly dialed in.
But there's a really loud and annoying hiss at all volumes, just like the cheap studio monitors I've tried in the past. It doesn't scale up or down with the preamp volume, or guitar, or by running directly into the effects loop. It's just always a hiss.
From what I can see on the internets, there's not really a fix. There's some bad design somewhere in the power amp circuitry and smart people have gotten around it, but IMO not worth messing around.
I'll probably play around with it for a day or two then run it back. May swap out for that Fender Deluxe TM, or may just look for a different cab. I'm kind of intrigued by the Mesa 2x10 with Creambacks: