Source of some problems with using this mod seems to be meshes\Characters\_1stperson\skeleton.nif missing. When I first instaled DR6 Wrye Bash skipped this file (Coronerras Maximum Compatibility Skeletons had higher priority I think). This resulted in camera 3 meters above ground and being unable to see my hands, weapons etc. When I gave DR6 higher priority camera returned to the right place. But overwriting skeleton for 1Person can cause compatibility issues with other mods, like BBB. Coronerra gave permission to work with his skeleton so it might be smart to use it.
(I still can't see my legs. When I activate script I can only see some magic effect under my character, but it's minor problem and not exactly DR).
Biggest problem for me is using bows in DR6. My character is an archer, and doesn't seem to have any advantages of DR fighting (except, possibly, criticals), and even this few moves he had so far - like zooming - are not working. He can't build up momentum. Bashing and kicking are not very useful, when you trying not to get to close. And from what I read in readme they are extra vulnerable to knockdown (and since they tend to use light armor too...) . On the Arena they will be eaten alive, it seems.
Some ideas for moves for ranged weapons could be:
1. aimed shot - you can't move, but you make slightly bigger damage (bigger chance of knocdown?) by firing with throw button.
2. quick shot - based on speed, limited by fatigue - by fast clicking you could sent several very quick but less powerful (without chance of knockdown, less damage) arrows. At this moment for both vanilla and DR just clicking cause you to make totally ineffective shot)
There is animation problem, when going into sneak mode with arrow nocked.
And it's just look ugly in FPP mode, when just tip of your bow is stabbing in the corner. Vanila FPP animation for bow made much more sense.
EDIT1: And I didn't have any problems with compatibility with Oblivion XP so far. But i haven't gained a level since installing DR6.
EDIT2: Can't jump forward when in hand2hand mode.