I finally decided the Windows Mobile 6 releases / cooked roms are stable enough and upgraded to Windows Mobile 6, using Windows Mobile VI Black Edition 1.2. It upgraded fine on XP (it wouldn’t work on Vista for some reason).

Now I am in process of upgrading the Radio to 1.38 (I had 1.18). There is a set of great guides at MrVanx’s web site.

I’ll keep you posted about stability and other things.