I only made a short test. Mine is working, when I have a Internet connection. I tried it in my garden, were I have been connected to the wifi at my house.
I think it is not able to work with maps, that you stored local on your N900, it wants to load always the maps from the web. So I decided this application is nice, but not useful for me.
Ok, just tried it with both supl.google.com and supl.google.com:7276.
Definitely seems to lock quicker than with the Nokia server, but may have had a cached GPS location anyway.
Unfortunately, doesn't make any difference to the widget.
It has worked very occasionally in the past (when I first got the phone) then stopped altogether. Thought I'd try it out again after PR1.2, but no joy.
I think it is not able to work with maps, that you stored local on your N900, it wants to load always the maps from the web. So I decided this application is nice, but not useful for me.
T.