BOBSTER  Been working with Sibelius 5.2 for a little while now. Quite the leap from Guitar Pro! Of course, GP is a lot less expensive, but it just can't touch Sibelius, the "kitchen sink" of notation programs.

Ease of use was immediately apparent - though there are some features that require tutorials/help files, still I find it a very intuitive program to use.  
(Version 6.1)

MMD, LTD  Well, version 5 is not ready for prime-time. I've been a user for several years starting with version 2. Each upgrade up until v. 5 added features without adding significant bloat. Not so with 5: it's pokey to start up, sluggish on anything older than the latest Macs, crash-prone, and worst of all, they've changed drop-down menus and dialog box functions so that one has to do extra clicking with a mouse (excessive trips to the mouse was one peeve I had against Finale). I waited to review this as I wanted to give tech support a chance to help me resolve issues, but they've been unable to do much. I also was waiting for a 5.1 update that might address these nagging issues (I recall a quick release of 4.1 last time), but it's been several months since 5 was released. Now that the developers have a good chunk of the market share, I'm sensing the complacency that plagued Finale: new versions are bloatware that have a few features heaped on rather than being a more efficient tool for musicians. I may look elsewhere for my notation needs, specifically for a developer who is still hungry for market share!  
(Version 5.0)

NICOLASD  sibelius came to mac os x first and best. finale is like the quark or pro tools of it's market. it was too lazy for too long thinking it had a monopoly. i dropped it in favor of the eager development team and friendly support behind sibelius and i haven't regretted it for a second. good riddance finale!  
(Version 4.1)

SVEN  Wonderful thing. It costs much, but it's worth the money. I used MusicTime for years, but I'll switch to Sibelius. It's really simple to create some sheets.

Thanks!  
(Version 3.1.3)

MADMEGDIGITAL  An outstanding notation package. It easily surpasses other programs in visual aethetics, ease of use, and OS X compatiblity. I spent years using FInale, and when I entered my first score in Sibelius it was a joyful epiphany: formattings were automatically correct and I didn't have to spend hours pushing every little musical symbol on the page around several times to get it in the right spot. What took me hours to do in Finale (particularly extraction and clean up of parts) takes me only a few minutes to complete in Sibelius. Highly recommended for those serious about notation.  
(Version 3.1.1)