Just an update, I spent a long time playing with custom mnu files on the XL but still didn't manage to enable auto off with power lost or speed warnings. Still a decent GPS but annoying not to have those features I found so useful - even the Via has those!
Just today I came across a Go930 for a reasonable price and ordered it, I also ordered a compatible EasyPort mount from ebay which is very similar to the more recent models in that it sits almost flush on the back of the unit and has a rotating ring which increases suction on the cup.
As for its internals, I believe its very similar to the Go720. It has three hardware features I don't think I'll be able to use once I change to the 9x Navcore - Light Sensor, Enhanced Position Technology (EPT) and a bluetooth remote control. The later feature I find quite obscure, can't quite work out what one would use it for.
Downunder did you ever get the light sensor working with 9x Navcore? I liked that feature when going through tunnels. EPT would be handy for that too.
Edit - looking at the comparison chart [Please Register or Login to download file] it seems that the Go940 and Go950 had EPT running on Navcore 9.054. AFAIK those models also had light sensors. I shall try that Navcore when the unit arrives.Here's a pic of a 930.. aesthetically it's almost as pretty as the Via