Please give us some feedback. Is it stable? Would you recommend?
Been using it yesterday. Seems stable so far, quite happy with it

Had a few problems at first though:
I had a bit of trouble getting it with Kies. It said "couldn't convert to download mode", and yet there my phone was stuck in download mode. Had to reset the phone by taking out the battery and then used Kies to recover it (When you click on Firmware upgrade there is a recovery option, it remembers that the firmware upgrade failed). That got it working.
My next problem was being unable to restore settings with Titanium backup, since carrying over settings from 2.1 to 2.2 doesn't work well and I couldn't be bothered to root until an easy method for this firmware is available.
Then when trying to re-install my apps using appbrain my phone ran low on internal memory after only a few apps were installed. Needed to do a factory reset to recover the memory which had mysteriously gone.
After all that, it's running pretty well. The internet browser seems faster, at least it doesn't suffer as badly from low FPS when opening the myadsl.co.za homepage.
There's a tiny lag here and there, once I can root and lagfix it that should be gone.
Google Voice Search and text-to-speech is there, along with a "Driving mode" to read out notifications and messages. Full Adobe Flash is included, could go onto Youtube and watch a 480p video on the desktop site.
There's several little tweaks, the Samsung keyboard has been modified (now you hold shift for caps lock), auto-rotation switch in the notification bar.
The Accuweather clock has disappeared. I downloaded "Weather widgets" from the market to make up for that.
Will report on the GPS when I get the chance to test it. I'd recommend it if you can handle any complications with installing it, since it's not official. I see it now has a built in backup feature. Not sure how that works but this should be the last time you lose all your settings
