Should we start planning for those Vista SP1 trade-offs?

I've been anxiously awaiting news of Vista SP1 since, well, since Vista went RTM.  I've expected that SP1 will bring an end to some of the Vista teething troubles that I and many others have been experiencing.  Now I'm starting to worry that SP1 is going to bring with it new teething troubles.

Earlier today my ZDNet blogging colleague Larry Dignan posted the following:

Microsoft: Some SP1 improvements have tradeoffs.

What Joe IT is thinking: “Tradeoffs? Is that like applications breaking?”

Whoa, whoa, whoa!!!  More stuff breaking?  The wording that Microsoft uses is quite worrying if you read between the lines:

Improvement:

Windows Vista SP1 brings numerous improvements to performance, reliability, and other areas.

Tradeoff:

A significant number of components changed between Windows Vista and Windows Vista SP1.

Microsoft actions and recommendations for reducing impact:

Microsoft tests a large suite of applications, searching for regressions in compatibility from Windows Vista to Windows Vista SP1.

This says one thing to me - expect trouble.  While Microsoft is saying to business (and consumers) that there's no need to wait in order to, but I can't help but feel that you'd have to have a screw loose or something to now be thinking of rolling out Vista.  For those of us that have already made the move, well, it sounds to me like there could be more trouble ahead.

Thoughts?