I used it a bit, and I like some of the new features over the G7, and also of course raw mode. This makes it unique among digicams. I also found the movie mode to produce quite nice results.
I was sad when I had to return the loaner to Canon, and found that I didn't want to go back to the G7 as my P&S, so later today I plan on buying a G9 for my own use.
I have started a G9 report and it will appear here some time before Xmas.
Michael