I love mine. I get a better signal in many places than I did with Verizon, all of my calls sound clear, no complaints from the people I call, the screen is absolutely incredible, easily the best screen on any hand held device I've seen.
The touch interface is fantastic, and it really is the best iPod they've ever made. With a screen res of 480x320 at 160dpi, anime episodes look fantastic even at 50% of their divx quality and down from 190mb to 89mb file size in h264 .mp4 format, and of course I can't go back to the click wheel after having coverflow and being able to flick and drag through my music list and jump to a particular letter in a song, artist or album list by pressing it on the right side of the screen. Infinitely better than the clumsy search function in the 5g and 5.5g ipod video units, and not having to back all the way out to the settings menu to turn on repeat for a song or a playlist is fantastic. In vertical view, just tap the album cover once and you'll see the off/repeat all/repeat 1 icon next to the track position slider.
I have 846 songs and 25 videos (30 minute anime episodes) on the iPhone (8Gb) and I've got around 463mb left, so it is enough to fit an entire season worth on it at good quality and more songs than I can listen to at any given time.
Maps is one of my favorite applications, especially in that it gives you the phone number of the places that pop up in a search and you can call it right from the maps screen, which is extremely handy when you forget a phone number for a restaurant or are out driving and want to make sure someplace is open and don't want to stop to rifle through a phonebook.
Having youtube on the phone is great, especially if you happen to be talking to someone about a funny video you saw on Youtube, instead of telling them you'll send them a link to it later, you can show it to them on the spot, and quickly e-mail it to them afterwards using the e-mail icon in the youtube app so that they can share with their friends.
Safari is great, though right now has a few minor stability problems, particularly when you're playing music while surfing.. I expect that apple will get it fixed in an update soon, though.
I really love this thing