Chris was thinking about putting a Fusion Drive into his computer, but they cost $1000 or more! Leo says that's because Apple's Fusion Drive is proprietary, so he'd have to pay the Apple Premium. A Fusion Drive is a merging of a spinning drive and an SSD, but it's not as fast as an SSD. Leo prefers to roll his own. He uses an SSD on his computer to run his apps, and has a spinning drive for file storage.
ComputerWorld has an article on how to build a Fusion Drive for a fraction of the cost, but it's not for the faint of heart.