The Yamaha came out without anyone really knowing about it. The first I noticed it was available was on the onecall site. There are not representatives from Yamaha on the this forum that can comment on and help a discussion of their products. We have a Denon rep that regularly visits these forums and discusses their products, and thus Denon gets quite a bit more attention here. Furthermore, Denon really raised the forum member' s hopes several months ago by stating that their new players would be chroma bug free, and that the new 9000 would also have SACD. The 1600 got caught up in this excitement of an excellent line of players, the ones to have, unfortunately, things have not quite worked out as originally claimed.
As for the Kenwood, here are the downsides:
1. Poor remote
2. Long layer changes on some discs (1-3 sec)
3. Slow disc loading (like most carousels)
4. Sensitive to dirty rental discs
Otherwise I have not had any signficant problems, and I not sure what the DTS issues have been, as the internal DTS decoder and bitstream have worked fine. There were certain concerns with the functionality of the 300 disc changer, the 5900, but I would not say the 5700 is "buggy." The upside is fantastic picture quality, and for better I would have to spend quite a lot more and go into the $3000-$4000 range.