I never use SMF for arranger gigs, preferring the control of playing my own chords, and changing style variations when I want.

I do use SMF (my own) at home for practising my combo chops whilst using my P85 piano.

I'll sometimes use them on arranger clinics, to demo the fact they can be used in a performance.

I agree with Cassp in that they are more suited for singers than instrumental players.

Ian