I definitely recommend waiting til Dec 22 when the EV of SP 2 is available. My company is experiencing extreme issues with the upgrade. 1. A lot of tools have regressed from not only 2008 to 2009, but from 2009sp0 to 2009sp1. 2. Roughly 200 to 300 drawings are now corrupt due to the upgrade. We are working with SolidWorks engineers to fix our drawings so that production can continue.
We have been informed that SP2 will fix all the issues we're having - but that's not for a couple of weeks away.