Ultra Nerd Mode: ACTIVATEDpic.twitter.com/ftZ9npHDJf
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
So, I guess it's breaking in ok. I'm 180lb, and have no butt to speak of, so it seemed overly firm for quite a while.
Feature/quality-wise it's great, comfort-wise I think I'm still undecided maybe.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.