Share Your Experience: Switching to Nexus 4 from an On-Contract Phone on AT&T

Hey all,

I am currently using an iPhone 4S that is on contract with AT&T, but I'm switching to a Nexus 4 (when it actually gets here). I am just interested if anybody here has experienced switching from an on-contract phone to a Nexus 4 on AT&T. If you have, it would be incredibly helpful if you could comment on this post and describe the process to switch and your experience with AT&T on this matter.