Back in the day I enjoyed video editing (DV) as a hobby. I had bought a powerhouse of a Windows laptop -- a Dell Latitude D800 with a Firewire port and ultra-high-resolution screen (almost retina! and this was in 2003!), loaded with expensive professional grade video editing software. One thing it still wasn't quite powerful enough to do was real-time rendering or smooth full-screen previewing of DV video. I just figured the technology wasn't there yet.
My friend, at the time, had a 15" Titanium PowerBook G4. Not purpose built for video editing. Not even close to new. He liked to brag about how it never crashed and how it could do this, and do that, and I always just ignored him. One of those Mac users.
So when we were both asked at the last minute if we could put together a video presentation, I said no way. There was not enough time to capture, edit, render to final-output DV file, dump back to camera for playback, etc. Couldn't be done in the time we had.
My friend said "sure, I can do that in iMovie."
Inside, I was laughing. I was thinking, there's no way. My pro rig can't handle that, how could his consumer laptop? With iMovie? Toy software! I knew Windows Movie Maker was crap. How could iMovie possibly be any good?
And yet... and yet... He did it. I asked him how he possibly found time to render the final video. He gave me a quizzical look and said "Render? I didn't render." Then he showed me. He pushed the "full screen preview" button from iMovie and up it came, full screen, full motion, no dropped frames, right off the timeline.
Honestly I was shaken. And I remember going home thinking "if he was right about that, what else can his Mac do that he's been telling me about all these months that I've ignored?"
A few months later I decided to find out for myself. I bought a 12" PowerBook G4. Sold the powerhouse Dell a few months later. Never looked back.