Dan's right, I do like it (oreck/green brush). I got used to using the 300 (like Mark) on most domestic jobs, but the green brush really makes a difference compared to the lousy oreck black brush. Been using it for a couple of years now with no issues - and no noticeable wear on the bristles either.
I still use the 300 i.e. for larger domestics, but otherwise its the oreck, because they work so well on stairs.