It's def impressive but don't lose any sleep over not being the first bunch to try it guys.
I'll second this. I played around a bit for the first couple days, but the novelty wore off pretty quickly.
Unless you know a lot of people that already have a Wave account, and have projects/tasks that you want to collaborate with those people on, it's actually somewhat useless right now.
And when they say it's a preview release, they really mean it. When you click on certain options right now, including 'settings', all you get is, "This wave is where you will be able to customize your personal options and extensions, but we are still working on it. ".
It's nowhere near ready for primetime.