Although the Callaway X460 driver is only 10% bigger than the 454 predecessor, the club head does seem a lot bigger.
This is due mainly to the fact that the head is slightly longer from front to bag to move the weight lower and further back.
The unique design of the Callaway X460 sole does make it very 'stable' at address and you can't move the club around as much as you can with other models. The club was very forgiving across all the clubface and it was easy to shape shots and hit the ball high and low
With the increase in head size the sound at impact is a little duller than normal for a Callaway, but that is just nit-picking as the X460 driver is a very competent club from Callaway.