Just a couple brief comments. I haven't actively participated in the BDP-83 threads since September when I started testing. I've also owned a Sharp BD-HP20U, and a PS3.
Primary display: Sharp LC-46D64U. I use an Onkyo TX-NR905 as a pre/pro with an external amp.
Initially I was excited as everyone else about some of the obvious features such as the elegant looks, heavy duty build, awesome remote, fast loading times, 1080p setup menu, etc. Not only does it do everything it should do WELL, but it has a lot of cool extras.
One thing about the BDP-83 that I haven't seen talked about so much yet is the reliability. With my Sharp BD-HP20U, I would often wonder when watching a movie, if I would be able to finish watching it. Besides requiring constant firmware updates, which they all do (and the BDP-83 makes this VERY easy), it also just seemed to choke up a lot, and I shouldn't have to worry about such things when I want to watch a movie. With the BDP-83 I am confident that I won't have a problem, and when I do, it's related to some bug being worked out in the beta firmware.
Part of this confidence also has come with my dealings with the OPPO company. The attention they've put into this player, and making it rock solid, listening to our suggestions and comments (and yours), and actually trying to implement them. The frequency with which firmware updates have been put out, dramatically fixing exactly the things we were having issues with. It makes me confident that when I put a movie in, it's going to work and work well. The problem with BD-players I've found, is that many can't get this simple, basic yet critical functionality down pat.
As far as the PS3, which for the most part has also given me the same confidence (although mine died after only 2 months of minimal use, and I had to send it back and received a scratched up refurbished one as a replacement - quite different treatment than what I would expect from OPPO), there were always several standout issues with the PS3 for me as a BD player. No bitstreaming, the clunkiness of using a game machine for a BD player, using the game controller as a remote (I won't buy the remote....and I won't buy an IR dongle), no SACD/DVD-A (at least on mine), and biggest of all- the noise.
The noise on the PS3 bothers me. I even waited for the new 80 gig player, foregoing BC (which I now regret), because it had the quieter fan found in the 40 gig model, and the fan noise still bothers me.
My experience has been a little different from some of the other beta testers with fan noise on the BDP-83 from what I've read here. I have been able to hear my fan come on at times, and once or twice, only during a quiet scene, was able to hear it from my sitting position watching a movie. This was only during 1 or 2 movies in particular, and only during a very quiet scene. The other times I've heard it was only when a disc was not playing, but perhaps afterwards, when removing the disc when I was up close. There have been a number of improvements made both mechanically and firmware wise which have improved things here, but there may be a case here or there where it can be heard. The EAP will be good for determining this I think. Also, I have it on top of a stack of several other pieces of equipment, including my Sherbourn 7/2100a amp, and my DirecTV HR20 (which gets very hot, and produces some serious noise!). Overall though, I would say the player is very quiet, if not silent, and this is a huge plus over the PS3 for me.
Honestly my disappointments so far have all been limited to "big brother" type issues which affect the industry. The region issue, things like what was written earlier about the chipmakers refusing to support ISO playback because of piracy issues. Everything else I believe with this company that if it can be done, it will be done. Heck I even remember Neuromancer a while back saying he's been asking for mkv container support for eons and look even that's here now.
What I would like to see: Network streaming abilities. I'm not talking about Netflix because I wouldn't set up an account with them anyway. Just the ability to stream from my PC to the player over ethernet. And for the list of these supported formats to increase.
edit: and I've drank quite a few beers while watching movies these past 6 months