What did you have done to your H?
I contacted them about Presence/Resonance mods when I got mine, and they said they were so busy they weren't taking mods currently and to ask again in 6 weeks.
I got the custom 50 and got to briefly try it out last night. The reverb doesn't work, so tonight I'm going to check tubes, etc.
I did get to check out the features. The channel boosts work great. In the video, Paul said the bright switch made a big difference on the Custom (I assume after many saying how subtle it is on the H). Again, only a few minutes time, but found it to be every bit as subtle as it is on the H. Also, the presence knob was VERY subtle. Turning it form zero to full only made a small difference. Nowhere close to the sweep of a presence knob on any other amp I've tried. Also, the resonance was subtle... and so was the mid shift. Both made a difference, but at a quick trial, not a big difference. I'll play with those more tonight, but pending my response from the seller, I might be returning it if I can't figure the reverb out. I can't imagine it being any less than a couple hundred dollars to ship to PRS and back, and have a repair done, and he said everything was perfect on the amp when I bought it. We'll see how that goes. It was a Craigs List deal but the guy seems to have money. I doubt he'd screw me over but...
quick word about the problem with the reverb which is twofold. One, it doesn't work. with the knob all the way up there is no reverb on either channel (and yes, I know about the switch to turn it off on the gain channel and it's not set that way yet). Also, when I walk across the floor, I get the spring noise that you'd expect when really jarring the amp, even though I'm on thick carpet and good floors and no other amp has sever done anything like this. I lightly tapped it with fingers (not knuckles) and it just makes that spring noise then as well, and this is with the verb switched OFF. It even does it when you hit a chord on the clean channel. meaning the little big of vibration it gets from the cab (and it was on top of the H so two sets of rubber feet buffering it) make the spring noise.
I'll see how it goes tonight
Edit: seller responded while I was typing this post and said there was no issue when he played it the night before. He said he'd at least split repair cost if needed.