Thanks bluecrab, good to know. The nice thing about the Kenwoods is that they have both optical and coaxial inputs/outputs and my JE510 doesn't. One source in my stack I would like to do some recordings from only has a coaxial output so I thought the Kenwood might be a nice option to open up more opportunities for digital recordings. I recently grabbed a Sony Walkman Type-R NetMD recorder to record FLAC files from my home server and I have been very impressed with the sound quality.
RE: the Kenwood ATRAC versions, if you Google the service manuals for the 2070, 3020, 5090, 9090, etc. they all list CXD2652AR as the ATRAC chip, which is only ATRAC 4. I have been unable to figure out if Kenwood just flat out lied about its ATRAC version in marketing materials, or if there is another explanation?