i would rather have a broken/smashed one, from Federer, Safin, Baghdatis, or from a few others.
i suppose these cost more than the ones that are stilll functional.
i wouldn't want to play with a Federer-like stick. I prefer something that is customised for my style.
Disclaimer: I'm NOT a coach...
Real tennis: https://www.youtube.com/watch?v=yDqnkLJ9BtM