Some of the best demos I've seen come from LA guitar ace, Peter Thorn. Fortunately, he's got a couple of nice Pigtronix demos, including the Pigtronix Aria Disnortion pedal, an analog effects pedal specializing in overdrive and distortion
He does a great job of A/B-ing the sound with and without the pedal on, going from clean boost to more and more fuzz and grit, so you can really hear what the Aria adds to the sound. And the last minute of the video where he plays two separate guitar tracks using another inset video will make you want to join a Lenny Kravitz cover band ASAP.
Oh, and bonus points for going Drop D for a bit of Neil Young's Cinnamon Girl ...
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