Just loaded and used it with my Sanyo Katana today and couldn't be happier. Great resolution, lightning fast hook-up, and I love not having to leave the house with a folder full of paper! It would be nice to be able to filter out finds, but that's a minor complaint. Another cool feature is if you close the phone, the navigator arrow and distance are displayed on the sub-LCD screen. Walked side-by-side with my wife who had the Garmin and it was dead on. I would definitely recommend this.
It's also nice to have topo maps and aerials available, too.