I got to play and hear the www.stellartone.com tone control at Jim Soloway's booth at the Dallas Guitar Show. I think it is definitely a great product, though quite expensive. You could get more standard PAF type midrangey tones from a Bill Lawrence pickup that way without compromising the natural tones of them.

A cheaper alternative is to put some capacitors on a multiple switch/push/pull system or such, though it might not be as simple and versatile. I think Bill's pickups and the Stellartone are almost designed for one another.

That said, I can't afford them at the moment. :\