I ran it for a few days after I got my c860 (early Feb). It worked, but I had problems with some apps and it was a bit glitchy. I also had problems with desktop syncing--a must have for me.
If I did not need syncing it may have been the way to go, the development community seemed more active.
I must add however if it wasn't for OZ I would not have purchased the c860. I decided that if I could run my three top apps (ssh, vnc, and a browser) at 640x480 that I'd plop down the $550US for a c860.
A week after I had OZ installed I noticed Cacko, installed it and never looked back. Cacko with X/qt has been the way to go for me. YMMV.