iWork users: how well does it work with MS office documents?

[M A V I C]

I have the demo install and will be testing it. Just wanted the general feedback from users.

I have 10 copies of Office 2007 for Windows that aren't even installed. So if I run into a major compatibility issue I can just use one of those. But I want to hear from people that already use iWork.

I'm currently using v.X and I'm guessing iWork '08 is at least as compatible as that.

Also, I have two upgrades to buy so the price really does make a big difference.