i have been using developer preview for some time and this is what my observations are:
1. its designed for touchscreen panels. so if you are using laptop metro ui is of no use, rather its difficult to use
2. another option is to disable the metro ui mode and use desktop mode. no significant changes from win 7 then
so win 8 wont make much difference to laptops and desktops. the strong point for win 8 will be the tablet pc's. it will be a nice experience from the current android tablets.