The biggest issue with the XB1 as a bluray player, right now, appears to be the audio sync. It's pretty far off of the sync I need to have my TV signal through the XB1 line up. Even though I am looking for an excuse to buy an Oppo 103, it would be much easier if one device could handle everything. We'll see.
I haven't had a chance to test this at high volumes yet. If it's much quieter than bitstream, that could also be a problem for me also, since I normally played bitstream from my PS3 at +0DB, when I was watching movies without my wife and kids, that is. Unfortunately, my PS3 lens is now shot, so I need to have some new player that's up to the task.
After 7 Years With a JVC RS1 - Starting to Get the Upgrade Itch