It is worth checking out. It all runs from the sd card at the moment so you can still use winmo normally. All you need to do is unzip some files to the card and run them through file explorer to boot.
I have set up a dual boot system which is pretty cool.
Darkstones latest Froyo HD2 is amazing, loads pretty quick, hardly any lag at all, battery life is very good. (lasts a good 10-12 hours for me with light use)
GPS doesn't work yet, and I can't get my Bluetooth to connect with my hands free but other that that its usable day to day. No sleep of deaths, responsive, great!!!!
does using the android build off the SD card mean that if I switch off and on it reverts back to winmo without any issues to progs already installed etc - if so I may give this dual boot a go, seems interesting.
Also using the darkstone build currently and its great. Might try out the 1.3a froyo build later for gps and better battery.
edit: just noticed rc1.4 is released.
I must admit having trouble with virgin mobile lately really made stop using my hd2 as much but last night I updated my radio and flashed the energy xtc theme and I so wish I had done so months ago.
I think this maybe the very first phone I keep past the renewal date and oh and can link to the exact file/download for a working android?.