I've had one incident, when the Pono was playing a known-good track and stuttered for a couple of seconds, as if it were going back and repeating part of the track. The track was from a Hyperion download I'd copied to the Pono's MicroSD card. Later, the track played without problems so I'm attributing this to one-time weirdness.
I have occasionally found ripped CDs in my collection that had problems. I'd dig out the CD and re-rip it. If that didn't fix the problem I'd use Exact Audio Copy to get a clean rip to WAV, then import to Itunes and convert to ALAC. Now this is part of the normal CD-ripping workflow: insert the CD, check all the tags (there are usually errors, especially in classical music), rip, then play the files to make sure all the tracks are clean. After a good rip-check, the CDs get filed.
Faults in CDs aren't always visible. Obvious damage can sometimes be polished out. Some CDs look perfect but won't play right on one reader, so I try them in another. If that won't do it, I use EAC. If that won't work I look for another copy from, preferably, another pressing. What I've learned ripping something like 3000 CDs. Hyperion's albums are tagged differently from how I prefer, but the difference isn't major so I let it stand because they're consistent within the Hyperion label.
As for the "Revealer," I think it's a good idea. Give everyone the tools they need to find out, for themselves under their typical conditions, and then decide what kinds of files to download.