Window 7: Is it even worth trying for free?

I'm starting to have serious doubts on how good the new Windows 7 will be. Firstly, it's not like Windows Vista was that popular. Then they announced that everything that will have Windows 7 preinstalled, will be easily able to be downgraded to older version of Windows. Now they're letting everybody try it out for free. Starting Tuesday, May 5, you can use it free until June of 2010. That's about 13 months. I'm thinking this is a trick. I'm sure once you install it, they'll make it a huge pain to switch to something else. I also bet they'll make you give them some personal information so they can bug you about buying it nonstop. Stooping to these tactics may be their best way for them to get customers. I mean seriously though, if Windows 7 was any good would they really need to do anything like this.