I just got my new iPhone 5 and I love it already. It is noticeably lighter and that makes it so much more comfortable to hold in one hand while typing a blog post.
I also love the bigger screen. It feels less squished.
The one downside that I see so far is that the connection element changed so it no longer fits my fancy Bose speaker. I use that a lot so I am going to have to find an adaptor of some sort.