Got my Nexus 4 yesterday and haven't been able to completely use it just yet. I neglected to purchase a nano sim adapter so my sim from my iPhone 5 won't work. I let my housemate give it a try and I am using it without a sim currently. So far, so good! I really like the Google Cards feature, letting me know the current traffic conditions for my work commute in one screen (along with the weather, etc). Can't wait for my adapter to show up so I can finally use this phone outside.
This phone does get pretty warm, but aside from that, the browsing is smooth and I'm finding new features left and right. For $300, this phone is a STEAL. The only thing I would miss from the iPhone would be the iMessages (some of my friends don't subscribe to a texting plan). But I can see myself using this as my daily phone.
I'm already used to the size.. Coming from a 4" screen, there's a lot more real estate when browsing the web. If anyone is on the fence about picking one of these babies up, do it! 🙂