It scared me how quickly it converts but it does a fabulous job - great bit of software Korg!!!
I have been converting very high quality MIDI files that have been created using MIDI standards and so the conversions were very good.
Of course there is a little bit of tweaking occasionally but a limited amount of effort to get a great result which could have taken many many hours done manually.
As MIDI files can be so so different in structure and channel assignments I would imagine that some would convert strangely.
I have a large collection of superb professionally created MIDIs and now look forward to many more great STYLEs from them.
If you have some great MIDIs - give it a try - you'll be amazed (I hope) - I recommend that if you are new to Korg arrangers then just spend a little time understanding the STYLE structure and STYLE recording basics.
Pete