Not a hit at android, but my surface rt or 2 have never slowed down after time or an update... Now my brand new nexus 7, with only a few basic apps like Skype, SkyDrive, etc, is now slow... All I installed lately was the new kitkat update. I was blown away. I was like I guess you really do have to restart android every few months... Maybe days, lol.
My surfaces have been super solid. My surface 2 which I bought Launch day sat in the box for over 3 weeks. I continued to use my rt. After the 8.1 update, the rt was faster and more efficient. I was like, should I return my 2? What is the benefit??
Well, my 2 proved to be worthy. It is faster, better battery life, way better standby life, screen, etc. I even took my receipt back to the Microsoft store to get in on the promotion for the type/touch cover combo.
I sold my rt to a friend she loves it. She is a college student and is very happy with it.
It is really what you want to do. I know this, the 2 is future proof. I don't think the rt will be unbearable like an apple update on an old phone, but it will show its age in a year or more... Unless one continues to use it now the way they will then.