It's not a great change. It's crap. It's spectacularly bad crap.
It's pushing clients directly at the "cloud" where Microsoft intends to make a boatload of money off you. Read: it'll cost you more over time if you follow their way of thinking, and they're going to do their best to force you into their way of thinking.
It offers virtually nothing to 99% of the current Windows users, and the 1% remaining is only of use to large enterprises that won't use it anyways because of all the downfalls, costs and failures of Windows 8 as well as its similarly hobbled server OS. Those companies are mostly still using Windows XP and Server 2008. Windows is a dinosaur, folks, and with Windows 8 it is about to become a fossil.
Don't "upgrade" unless all you want to do is play with something different. It's not better. It doesn't offer you something you don't currently have. It's going to make you cry.
Seriously. If you're not a *total* gadget geek, you will hate this POS.