I think Overture also handles it very well (full VST integration, editing MIDI directly on the score) although its most recent update was almost a year ago so I don't know if there is going to be any support for it in the future...
http://www.geniesoft.com/products/new_f ... ayback.htm

Notion seems to be primarily a composition tool. How well can it (or will it be ever able to) replace more notation-focused programs? (e.g. using other music fonts, including some specialized signs - for example, early music/mensural notation signs, extracting parts, producing printing press-ready s...

DDMF eqs (IIEQ Pro, LP10 and ColourEQ) are top quality: http://www.ddmf.eu/
Each of them can be bought for as low as 35 Eurocents (or 50 US cents) - you decide how much you want to pay.

I don't envy them - they put themselves in a difficult situation releasing a software product still in a beta stage and calling it a finished program. Now they have to deal with crowds of disappointed customers - must be a pretty hectic and nervous time now in Greensboro.

A quote from a competitive software forum: "Notion seems to load up an independent Player VST for each preset, so you can end up with a ton of ARIA Players that only have 1 out of 16 presets loaded." Is it true? That would seem like an enormous waste of CPU and RAM resources (I'm sorry, I ...

I have an older (Kompakt) edition of EWQLSO Gold + XP Pro - will I be able to use it for playback in Notion 3?