I upgraded to 10 on my laptop and so far not too many complaints mostly just getting used to a new interface. I will upgrade to 10 on my desktop sometime in mid January. As I understand it there will be no costs if you upgrade to 10 during the free period. If not, then you will have to pay for it. The internet fees apply just like in all other versions. You can't really use your computer for much without an internet connection. I believe there was a major upgrade to 10 in late Dec which fixed a lot of the earlier complaints. Hope this helps.