Yes the main thing is that all of these are basically "only" start screen updates, which of course is a huge update (for me at least).
Bug that is present in all roms I guess is that some of the tiles not changing color after theme change, but thats very minor thing.
Also there seems to be a thinner font in these roms. That is little buggy in some places, I noticed today that in txt messages, I think if I wrote "s" a gap would appear after, like this: "Tes t". I didnt really test this so much, I was running the rom for maybe 3 hrs and 5 messages. But this also isnt a deal braker, everything was working and readable.
I only used this rom longer period (3-4hrs): WPV 8835 Nokia Edition v4.1
http://www.winphoneviet.com/forum/showthread.php?t=12350, which is actually was running smoothly. I didnt see any major bugs. (my day has been maybe 3hrs today between all this flashing :cyclops
The main issue for me is that there is only English and Chinese keyboards included, I need Scandinavian keyboard layout.
I didnt see any bugs on facebook, twitter I didnt use today, but at least it got my Twitter feeds in the beginning... Also messages to WhatsApp came through.
On Nhathoa's rom with17.XXX radio here:
http://xdaforums.com/showthread.php?t=1689156. This one is the only rom at the momoent that actually has other keyboard layouts besides English and Chinese. However, I was experiencing MAJOR connection issues. I have never seen this before. The issues are so severe that it is unusable for me. When booted and entered pin code 99% f the time in 20 sec all connections dissapeared and it requested pin again and in most cases would not even get connection back after entering the pin. Sim errors appeared many times when I was trying to get it to work. BUT this didnt seem to affect everyone. Only me and maybe 1 or 2 others. On first boot with this rom I was stuck on connection manager loop, and exiting connection manager in any point didnt help on the connection problem. I tried to get this work many times. Did hard resets, flashed again etc...
So besides this weird connection issue my main problem is the missing keyboard layouts. If you are using English or Chinese layout, you will have no problems on that matter.
This is a beta release no doubt, but like I said before the start screen is a huge update. I wouldnt most likely have any problems running the WPV 8835 Nokia Edition -rom, if it would have my keyboard layout. But I didnt try any bluetooth file stransfer or aynthing. Facebook, WhatsApp, IE, email, SMS things liek this I did today and didnt notice anything wrong.
I now downloaded Nhathoa's rom with the 16.XXXX I will check is the connection issue present in that one also. To be honest I would have waited on WPV 8835 Nokia Edition v4.1 if I would have known this EB Edition is also missing the keyboard.
I dont know, I hope this helps someone even though I havent done any step by step all functions testing.
Edit: On the Nhathoa's rom, I remember once I got so far that I was downloading apps from marketplace. WeatherMaster claimed that GPS was not on. I have never seen this either. What is causing the connection issues there for me are some really major things.
Edit2: This rom also has the turn off bug like said earlier. I just tried to turn the device off with no luck.
Edit3: Nhathoa's rom with 16.XXXX radio no connection bug,
FINALLY I found a rom that works and has more keyboards
Also the bug that you are not able to get tiles to the biggest size is present in most roms. To me this is not a problem. I dont even want to use a tile that big. Maybe if there would be a GOOD calendar tile with lots of info I would, but not now.