Right now it's my PW. I can hit it anywhere from 140 yards in (really have to close the face for that yardage), and like to bump and run around the greens.
For the first time in my life, the favorite stick in my bag by a large margin is my driver...the r7 425 with the ProLaunch Blue shaft.
I hit sooo many more fairways with this club it is amazing. (The previous driver was a TM R540 with a stock shaft).
On short par 4's, I now leave my Sonartec in the bag whereas before I used it religiously. I can hit a knockdown/stinger with this driver reliably about 75% of the time...
And when I want to let it all out, I still get good control...
I love having about 165 yards to go so I can use my 6 iron. It has the best bits of every other club, you can get a nice bit of spin (when you do it properly, which is rare), you can shape shots left and right and you can play low penetrating shots. Also I find that with 7 and up my knees start to interfere a little but the 6 is just sweet. I aslo use it for chip n runs around the greens sometimes which I am almost certain of getting within 3 feet every time which rather oddly can't be said of a putter from the same distance.