Just some quick impressions :
MY LCD seems to have stopped working when I loaded this firmware. There's a horizontal scan line that runs down the screen if I hit one of the buttons, but nothing comes up. (this one doesn't really bother me that much since I rarely ever look at the LCD). [edit] This one might be related to a blunder I made when I updated the firmware, but I won't be able to tell until I either downgrade or upgrade the firmware again
When I loaded my saved settings, the router stopped responding. A panic press of the reset button brought everything back up though. Once it came up I just logged in the router + redid most of the settings manually again.
Gamefuel seems to work a lot better, least I was able to run a Metal Gear Online update on the PS3 (which uses Bittorrent) and latency didn't spike as badly on my PC. On the old firmware this particular test would choke the DSL connection badly. I'm assuming either something was fixed or I previously broke something badly fiddling with the gamefuel settings.