Its too early yet but (as is) I would not take windows 10 over windows 8 and Microsoft has a LONG road ahead of them convincing doubting consumers that windows “as a service” will be better… whatever that term eventually entails. The windows 10 beta is free to use as long as Microsoft is happy to allow people to use it and then it will be taken away in exchange for whatever Microsoft feels (at that time) is best for Microsoft.