I played the Ping G15 from the time it came out until last season, which was roughly 4-5 years. Not sure I ever hit the ball as far, as consistently straight, as I did with that club.
Although I upgraded to the adjustable loft variety last season, I still keep two of these drivers (exactly the same) as backups in my basement (I bought an additional used G15 driver the following year, exact same specs, just in case something happened to the one I was using back then).
I think it's the best driver Ping ever came out with. I took it out last year for a few rounds and honestly it performed just as well as the newer adjustable loft driver I was regularly playing.