Yep, Musitek, I've taken the plunge and bought the "midi" version after a quick try with the trial version. It will make Midi files, which I can feed GO with, Finale will import both Midi and MusicXML.
Considering the original looks like a handwritten original from 1740 ish it's not too bad. I did start by enhancing the original in a photo editing app, improved contrast and brightness, converted to B/W and wiped out as many obvious marks as possible; I also removed the accidentals and the numbers for the figured bass; the # in particular were dire. (for a sample page see my PDF to midi thread) All in all I think it's probably taken me about 4 hours to do 26 measures of 2 staves, and that includes the learning curve!
I will next import to Finalé and work out the figured bass reading from the print or the PDF, so far I have the first movement done "by hand", and half the Allegro Midi-ed, hope to get the rest of the Allegro done this evening, that will just leaave the minuet. May have it finished by next year (still got 2 days of this one!)
I'll try both midi and XML imports just in case there's a difference.
Afterthought; one could almost manage without Finale by using the edit function in SmartScore except that it is slow and not that intuitive at first. Not so bad from a decent print or PDF file but I wouldn't like to do the figured bass work with it.
Now that I know what sort of "enhancements" to make to dodgy originals I'll probably be able top cut that down an hour or more. On a decent printed page probably much less than that. For $49/£32.85 it's probably worth it if you do a fair bit and don't need all the bells and whistles of the dearer versions. (More staves/parts etc)