Sometimes I'm not sure which side of the "at all usable with a mechanical swap disk" line OS X is on. It certainly tested the boundaries of my personal threshold of "usable", at least. Spinny beach ball, spinny, spinny ball.

Switching to a MacBook Air and thus solid-state storage made OS X an entirely new operating system for me. I'm in no hurry to ever use it on a spinning platter disk again.