My JVC XL-R5010 has been 100% reliable.
Music CD RWs are getting scarce.
I can't think of a "reliable" 2 tray unit (I have a Pioneer PDR-W839).
If you have a decent CD player take a look @ the newer Tascam 900 MKII model.
With the Pioneer the recording quality increased when I plugged it directly into the wall (sans power conditioner).
Don't know why this is, but doing so was recommended by someone in the industry and they were right.
Please explain the difference - I don't understand what you are saying.
My Pioneer CDR had two drawers (separate cd drives) in which one is a single CD record/playback and the other is a 3 CD tray for playback only.
I assumed that the OP wanted the convenience of duplicating a physical CD using a single unit in a 1X process.