Pros: Ability to shape the ball / Control
Cons: Not always the most forgiving
The 909 D2 is a fantastic driver. Although the 910 D2 is now out, it is still a very valuable addition to any golf bag. After testing a series of drivers, I found this to be up there with the longest but the easiest to control. Fades and draws are extremely easy to play with this club and it's very easy to get up in the air. The fact that the stock shaft length is 45" is great, at least to me, because it's much easier to make contact in the sweetspot than with other drivers. The face is 0.5 degrees open with has turned my stock shot from a small draw to a dead straight shot.
Although I love the driver, it is not perfect. I would not suggest this driver to people above a 15 / 20 handicap because it's not the most forgiving of the bunch. To me this is an advantage as it lets you know where you've hit the shot and the trajectory reminds you nicely to hit it in the middle the next time you take it out of the bag. Additionally, it sometimes launches the ball too high for my liking and that's when I wish I had the more compact 909 D3 head or a lower head loft (currently 10.5*).
This is a great driver and can now be had for cheap since the 910s have come out.