I love flats...for certain things. If you want a snarly aggressive tone, then no way in eitch ee double hockey sticks should you use flats. Rock/Metal and flats? Pass (Steve Harris excepted).
If you're playing old school music, then by all means use flats. I like them for jazz too. Funk can go either way IMO.
If you're playing old school music, then by all means use flats. I like them for jazz too. Funk can go either way IMO.

