I was lucky enough to order one of these after release and have been in possesion of the N1 for nearly a month. Those who own a iPhone like myself the packaging is very nice, well you won't be disappointed with the Nexus Ones packaging equal or better depends on ones taste. The phone straight out of the box looks gorgeous with the 3.7inch AMOLED screen and as soon as you turn on the phone you get a idea of how rich the screens colours are it made me think why on earth the iPhone 3GS hasn't implemented such a screen? If you are a HTC Android user you'll notice how fast the phone is with the Qualcomm QSD 8250 1 GHz processor, I haven't noticed any difference in speed after installing over 25 applications from the Android Market which required updates and they have addressed the issues now as they were not displaying chargable applications and only the free apps previously. One feature I am having a lot of fun with is the voice recognition, you can talk and it'll type the message for you (one sentence at a time), open applications, call contacts and find places "Navigate to *****" I love this I have been playing with it whenever I am out and about and it never fails to please me. Impress your friends with your pattern lockscreen. The phone has many positives and I feel I maybe passing my iPhone down to my siblings as the Nexus One feels nicer in the hand, screen is more responsive, colours are richer, processor is faster, camera is 5mp which takes good photos along with good video recording, AGPS works a treat and the live wallpaper along with the widgets really do add to a great experience..
One important update recently added to the Nexus One "pinch and zoom" and this was much needed for the photos and especially the browsing experience and the wifi connectivity updated now it priortises wifi over 3G which was much needed to reserve battery at home.
3G users the battery life is gonna be just like any other touchscreen but you can carry a spare battery :)
There are a few things iPhone still holds over the N1 a better keyboard (I hope with future updates of the OS the N1 will improve it) and the iPod on the iPhone has a shortcut but double tapping the home button (N1 doesn't have a way of getting into the mp3 player without unlocking the phone which may put people off who want to use the mp3 functionality.)