I had a 2017 Custom 20 that I absolutely loved, but lost my mind and sold it in 2019. Regretted selling that amp ever since. Over the last year or so have been looking at getting a new all tube amp, considered Fender Hot Rod IV, Mashall DSL40CR, Blackstar HT line, PRS Sonzera and a few others. Bottom line, all these other amps just don't have the build quality of the PRS US amps, which the 2 channel custom Custom 20 is. Happened across one another 2017 Custom 20 at a Music Go Round and just got it last week. Once again, couldn't be happier. If you want a super quiet amp with killer clean and lead channels that will give you pretty much any tone you want, with more than enough volume, you simply can't beat it. If you can find one, get it. I know Dave's Guitars in Wisconsin has one on their website right now.
BTW, the Custom 20 does have the Push/Pull Mid Shift, as well as the Reverb Pull for Defeat on the Lead channel, just like the Custom 50s.
Cheers!