I myself am torn and this whole 2007 upgrade has prompted me to do some research.
I upgraded to Finale 2006 in February and have had nothing but issues with it. When I use softsynth, it plays notes that don't exist in the score, will sometimes repeat parts when there is no repeat or not play parts at all. Depending on whether or not my computer feels like loading all its RAM it will crash when I try to use GPO sounds. A Powermac G5 with 2.5 gigs of RAM should be more than sufficient to handle Finale. I check my system utility that monitors how much memory I'm using and I always have at least a gig of RAM leftover. WTF is it doing?
So I feel burned from 06 and I'm afriad upgrading to 07 may make things worse. On the other hand it may make things better. I've even debated switching to Sibelius. I've wanted to learn it for my copying and engraving services so I can market myself as a user of both.
Has anyone else had problems with 2006 crashing? Is Sibelius more stable?