I use a 1HBH. I think I could rip the ball a bit harder with the K90, but the Yonex 89 is no slouch. I didn't have to make any real adjustments to my backhand with the Yonex. Very stable and solid. Returns are crisp and accurate.
Lois: "Peter, I'm not wearing any panties."
Peter: "That's ok, honey. We can throw that chair out."