I am one of the folks who is in the beta and I like it but I don't.
To me the new main window that they use instead of just going to the "desktop" looks more like something from a Windows phone. The idea of installing apps etc. is cool but again... ideal for phones. I had a really hard time trying to figure out how to get to certain things or to change specific settings. It's a learning curve for sure for anyone who is used to the typical "start menu" world. Now all that said, it does seem a little less resource intesive but I haven't had the opportunity to really test out some of more more memory hoggy stuff on the box I installed the beta onto.
I was a Mac girl for the longest time (still am technically) until I decided I needed a laptop instead of a desktop and had no choice (financially) but to go with a Dell. I was actually shocked at how much I liked Windows 7 (and still do). While I'd still prefer a Mac over Windows any day, my final answer is that I have no plans to upgrade any time soon. I'm good with Win 7 until I can afford one. LOL!