If you look on the Technology page of AB you will find reports that are on balance very discouraging. I have also been warned by 2 independent expert sources that (i) I don't need it (ii) your computer system can suffer a lot of damage if you simply follow the instructions given and (iii) that the whole thing in effect is a gimmick to get you later to buy all sorts of other technology that will only work with W 10. In other words, forget it (unless you are a computer whizz kid or something)!
It's brilliant in my book but using it in conventional pc form and not in tablet....much more speed to it and no impact on the office suite etc - in fact, it appears to be a lot more stable, some nice features like being able to read newspapers in book form.
I don't see the point personally, only the temptation of being offered something 'uptodate' for free.
By the time Windows 10 stabilises I'll probably be after a new laptop anyway.