Hi Dave,
it's not exactly cheap.

I just had a quick look at the site.

They used to have a demo version, couldn't find it.

Also you used to be able to buy for individual keyboards ie korg or roland etc which meant you could buy for a single destination keyboard ie yamaha, you could still convert from different manufacturers, but the converted style could only be used on yamaha.
Appears there's only Universal now which is rather pricey, unless I've missed something.

When I refer to midifiles , I'm not talking about song midifiles.

EMC does convert song midifiles into styles. Personally I've never had much luck with the type of songs I play.