I upgraded from Sibelius 4 to 5 for a project the was postponed. It was resurrected after a few of months and I had cause to ask some tech questions relating to MIDI setup. They flat refused to speak to me because I had bought Sibelius upgrade some 115 days ago, even though this was the first time I'd booted it after installing it. Seems there's a 90 day cutoff on telephone support, never mind it was the first few hours of me actually using the software,

In contrast, I needed to talk to MakeMusic about an EPS issue between a previous version of Finale (2007) and Adobe Illustrator CS3. They happily spent 10 or 15 minutes troubleshooting with me and flagged up the issue which I found could be worked around easily, and was fixed by an update.

I guess this isn't a "negative" for Sibelius (I don't fancy my chances getting live Tech Support from Apple for Logic) as much as it is a plus for Finale. Either way the issue took a few more days to solve with Sibelius than I think it probably should have.

My overall impression is that the famous "ease of use" is only sustained for as long as you want to do things "the way sibelius wants to do them", and as soon as you try to use conventions outside of Sibelius sphere of comfort, it's poor and hacky. It seems to me that Sibelius is akin to "Pages" and Finale is more like "InDesign". You'll be up and running quickly in Sibelius, and if you don't want to make anything too challenging you'll probably be OK.