I finally got around to setting up the new Raspbian image tonight. So far I'm really impressed with how well things have progressed since the debian image I had been using. There is a nice config tool to help with a lot of the initial setup stuff, although I did have to do some config.txt modifications in order to get any video at all on boot. It even has an option to resize the partition on next boot to fill your SD card. It's still not what I would call "fast" for things like web browsing but for the short time I've been using it, it is noticeably better than the old debian image I had. If you're not sure about upgrading, I'd say it's definitely worth the effort. Of course one of the great things about the Raspberry Pi is that you can just pop in a different SD card so swapping the OS is a very minor compared to other PCs. I also put it in it's shiny new adafruit pi box which is very cool. It's a very clever design and looks cool with the board exposed and the LEDs doing their thing inside.