A lot of truth being said, I'm going to add a different thought:
These lvl 1 Callies with their 3.5 meter speed look like newbies' traps to me. They ease the game, they are expensive, they lack other characteristics which would enhance the performance.
You may have to face club/ball combinations with faster meters - are you prepared?
Take the Srixons, they are equal or better in the other categories, cost 55 %.
Take my coveted lvl 33 Callies, even better than the latter and still only 80% costs.
As a Pro, I played the Tour-SD, less than 25% of the price, and they served me well.
Think about it to avoid a "cash cow" fate...
Have fun!!