No way would I put a 975 sized driver in the bag. The forgiveness of the larger face 460 sized driver is a big part of what makes hitting the driver fun!

Funny you should bring up your experience.  I just purchased a new 913D3 with an expensive aftermarket shaft after a fitting showing a net 20 yard gain over my current png driver.  I traded in my png driver to absorb some of the cost of the new driver so my buddy let me borrow his X2 hot deep 2 wood which is 12.5 degree loft and 43.5 inches long as a interim driver replacement.  We played Sunday and I hit every fairway while averaging over 260 yards in total distance.

To make a long story short the range near me has 3 gch2 monitors you can use if lessons are not going on.  Needless to say after speeding over $500 on my new driver the X2 Hot deep is only 5 total yards less than my newly order driver.  

Withander,

You are not alone. It took me a long while to get used to the bigger heads. I felt more comfortable turning over the smaller heads. The big heads always felt like a tennis racket and I just never felt like I could let go on it. For me it was mental. Then I finally got used to them. WIth that said, I would love to see a smaller head driver. Problem is, it is a really small niche market. I highly doubt it would be economical. From what I understand (could be true could be false I just read it from another site ) there is a D4 and a D5 head (something like 425cc or something) but they may never see the light of day. The bigger heads for me are still harder to work. So sadly, I do not think we'll ever get a chance to have a smaller head for the foreseeable future. But if that TM mini takes off who knows...............................

If your new shaft is a standard 44" then the 43.5" is close to a driver shaft.  One other interesting fact that I just learned about fairway woods and hybrids.  USGA does not regulate the thickness of the faces of the heads, only on drivers,  and on the X2 club, which is a HOT club, the trampoline effect off of a 12.5* face could carry the ball a considerable distance and it could only be a few yards shorter that your driver.  In some cases, loft means more carry and more distance......   Ever notice how far Lefty hits his three wood.  Longer than a lot of other pros on the tour.   I had a hot cally three wood (13*) and sold it  and bought a more consistent 913F* 15 adjusted to a 14.25......