I agree Gord - sometimes, just for fun at the range, I'll hit a few balls 2 plane, then hit some 1 plane. I can make both work, and get decent results with both.

Oddly enough, when I'm thinking about my swing, and trying to make a 'technical' swing, I often find myself swinging 2 plane (ie keeping the hands more in front). I can usually tell when I've done this, as I come out to in a little bit, and either pull it or fade it hard.