I just successfully installed 1.5 BETA 2 on my Q650 using sysinst 
(and instructions from http://murphy.dyndns.org/ ).

My only problem was that it is very difficult (or impossible) to 
install onto 2 hard disks without installing on one, then manually 
copying stuff over.

Otherwise, everything went great! I just thought I'd mention that for 
the benefit of whoever is working on sysinst... I know you guys don't 
have enough to do ;-)

Daniel