We're an ISV, but we don't get special consideration from MS - we downloaded a beta-RC1 in November and did what we could to try the software out. We got no documentation on how the final would differ from RC1. We got no documentation telling us how to transition software. I had staff waste 3 days trying to work out how to setup the new IIS with our web software for review. There are no comparison guides to say do it this way.

Our beta-copies died the day that Vista was released. I don't have any budget to rush out and get a copy of Vista, so customers will have to wait until there are a few of them to justify the expense.