I got my DV-137 set up over the weekend. I played a variety of disks non-stop for about 48 hours with no problems.
Audio playback is excellent. I didn't do a direct comparison with my DV-79, but there did seem to be an improvement with all types of media. The 79 was stunning with DVD-A music, but this player seems to be a bit better. I have no complaints at all with CD playback, which means that I finally have a "universal" audio player that I can live with. (Over the years I've owned and sold the Denon 2900, 2910, and 3910.)
For video the DV-137 is connected to a Panason AE900 720p projector via HDMI. I used Arcam's cailibration software, which was good, and output at 720p. I watched Return of the King, and the picture was excellent. I'm more of an audio guy, so I tend to notice the major problems. Didn't see any here.
All in all I'd say my system will not be upgraded anytime soon. I have the DV-137 matched with Arcam's AVP700/P1000. Speakers are Paradigm Studio Reference 60s, bi-amped, and the CC570 center. The last thing I need to do is buy some rear speakers.
Unfortunately I realized over the weekend that this system is more enjoyable to listen to than my more expensive two-channel rig...