I have played all the PXG drivers up to Gen 5. My order of preference is Gen5, Gen2, Gen4, Gen3, Gen1. I liked the Gen 5 so much, I added the Gen 5 hybrids and 3 wood.
@backinit is correct, the Gen5 at $199 is a great deal. You can get the standard Gen5 0311 or the slightly more forgiving 0311XF. Each one has 3 changeable weights, and the adjustable hosel allows +/- 1.5 loft changes. You also have a half-dozen shaft options in each flex.
The Gen 4 was a good driver as well, but the Gen5 was just an improvement all around. I was perfectly happy with my Gen 4, then I found a Gen 5 with a shaft I wanted to try out.
Launcher HB has no adjustable hosel and no weights to adjust. Old school.