I love it. I’ve used almost everything (use a Blackberry Storm also for work). It is the type of phone for gadget geeks, you can do a lot more on it than an iPhone, it just takes a little more thinking. I don’t even use the GPS in my car any more, it has a Navigation using Google Maps satellite view that works far better.
....and there is this thread:
Does the X really provide a WiFi hotspot for other computer users in a permeter?
I tried the Navigation app on my Nexus One the week after I got the phone; Before that I was looking at replacing a Garmin Nuvi that had left my life last year. Figured I'd try the Navigation on my phone out since I had it. I wasn't expecting much. Man, it was one pleasant surprise after another.
First I was impressed that the phone successfully decoded my voice "Navigate to..." instruction the first time. Then the turn by turn instructions were clear and well placed (Garmin had much better voice and more accurate street pronunciation) As I approached it told me my destination was on the left. Yep, there it was. I pulled in and was preparing to exit the car when I looked down at my phone and noticed that it had a street level picture of the house itself. Not only that, but when I clicked on an icon I got a 360 degree draggable view of the location, including the sky and street pavement.
A dedicated GPS might have a few more refinements, (nicer voice, I miss optimized multi-point navigation) but the convenience and cost of Google Navigation (free with my phone that I have anyways) tips the scale against me ever buying a GPS again.