New Marantz Model 30

" does anyone who has the unit or otherwise knows whether this unit will play dvd-r discs that you burn yourself.

stereo playback for SACDs, audio CDs, CD-Rs, CD-RWs, and DVD-Rs"

Yes, up to 192Khz/24bit PCM and DSD 128x files on DVD-R or RW discs.  

The specs don't list DVD-Audio discs, so I would presume it will not play them.

I have the 30N and it is superb sounding and easily worth the money. I have previously owned the SA8005, the ND8006 and the Denon DCD-1600NE.  

I have not had any problems with mine.  Really been enjoying it.  I also bought mine in February of this year I think.