I used it on my TMobile G1 and now on my DROID and its an amazing piece of software. I flashed TONS of custom ROMs on my G1 and in 15 minutes I restored everything and was back to exactly where I was before the flash.
Like I said I have used their software on my G1 and its an absolutely stellar piece of software. I highly recommend it to anyone looking for a good backup solution for their Android device.