Hi Genesys,
I'm probabably an example of the type of user Spalding is referring to.

I know the style creation/editing features of my Korg pretty much inside out. The same as I have over the years with my Technics, Yamaha , Roland & Ketron.
I heavily rely on editing functions, the styles I put together are from various sources including, track copying of internal styles, intro's & endings from song based midifiles, BIAB conversions, EMC conversions. A lot of these styles require more than just the changing of instruments or panning, they require note editing. THat's why my SD1+ didn't work out for me.

With decent editing functions, it doesn't matter if a keyboard has the type of styles I use, I can find one that closely resembles & alter it, or fix up an EMC conversion that contains wrong notes, whatever.

The styles I put together don't come up to Rom style quality, but they are useable.
If I was a bit more musically inclinded, I'd probably be able to tweak them up just that tiny bit better, but unfortunately my brain leans more towards the "How To" rather than the perfect musical result.

I sort of find it a bit odd, the number of musician's that appear to be content just using onboard styles.

best wishes
Rikki