I know some are saying goodbye but I just got a new 810 off eBay and am going to give it to my daughter to replace her 521. She wants a front camera and no app limitations due to low ram like the 521. I installed 8.1 and it runs great. She should be happy with this phone for a while. As long as we can get updates thought the developer preview I figured it should be fine. I am still hoping that maybe T-Mobile will decide to official release 8.1 for it.