I haven't yet tried it as my spare PC is in bits. I have tried the similar phone version which I liked but at the moment my feelings are it is not great for a desktop. I do plan to get a new laptop about the time it comes out and perhaps I will go with Win 8 if I can get a good touchscreen one. I love Win 7 on my desktop and I really think Win 8 would need to be something really special to get me to change right now.
I have been trying to get to grips with it but I have found that I really do not like the Metro desktop so I tend to stick to Win 7 for all my day to day usage. Perhaps if it was my only O.S. then I would make more of an effort but while I have the choice I won't bother. I'm fortunate that my motherboard allows me to select which drive to boot from so I am able to have a clean install on my second hard drive rather than the normal dual boot option. This will at least make it easier to get rid of it if I finally decide that it's a step in the wrong direction.
I am still on XP and have been told its not worth upgrading my computer to win 7 until I need a new one. Will wait till support for xp stops. Then decide. Am using win 7 at work and like that. Have no need of a touch screen so see no need for win 8