I picked up a Big Bertha Diablo Draw Driver with Regular Shaft at Goodwill for $10. It always felt pretty good, but I consistently hit a fade (or slice) with it. Overall, a very nice club, though. I played with it for about a year before the shaft cracked and split halfway between the head and the grip. (You don't get much for Ten Bucks anymore.) I was surprised it cracked because I'm not a hard swinger anymore at age 63.
So I had some Ladies' .335 shafts from Ebay sitting in the garage, and I thought I'd try one and see what happens. This club has a little hosel/shaft adapter, so I had to buy one from Golfworks.com It took quite a bit of prep work getting the old shaft and adapter sleeve out because the sleeve thing melted when I heated it up for removal. It took some extra time to clean out the hosel properly. But I finally got the new Ladies' shaft and sleeve in, and took it out to the course the next day.
It took me a while to realize that if I swung this thing nice and easy, I was getting about 20 to 30 yards more distance than I ever hit it before. And it totally cured my fade. In fact, after years of aiming at the edge of the fairway to allow for my fade, I'm now aiming straight down the middle, maybe even setting up for a very slight draw.
I play with my brothers, so they gave me a little grief about the "Ladies" shaft. But the laughing changed to "Geez" when they saw the ball disappear way down the fairway.
I think this model of Big Bertha Diablo Draw woods is probably at least ten years old by now. Which is great, because I want to add the 3-wood and 5-wood to my bag, and I see they have a whole bunch of them on Ebay for under $40. I've got more Ladies' shafts to use up. And some pink grips.