Back to topic...don't be fooled by endorsements; many of the top players have switched club brands without much change to their sticks. The new company tries to match what the player is used to, even if they don't make something similar. Mickelson and Els are now Callaway guys but they had much of their success from their Titleist gear. Ditto Woods (grew up playing Mizuno IIRC) and Nike.
"When a man is tired of London, he is tired of life"...Samuel Johnson 1777
"When a man is tired of Federer, he is tired of tennis"...stringertom 2014