Cleveland HiBore XL. It was a rocket launcher for me and was nice and loud when you hit the center of the face. I had one with an Oban Devotion 8 (85g) shaft in it and I could swing that as hard as I could as the shaft was so stable.
Then one day, I could not hit a 10.5 degree driver and had to opt for an adjustable version that I could crank up to 12.5.