I've said this before, but they wouldn't do it if it didn't work. Just google "video engagement vs. text engagement". It really does increase conversions and alleviates a lot of confusion. It doesn't excuse the need for descriptive text, but rather complements any online offering. Seeing is believing.

I agree with this sentiment, I too avoid video, but it is a very easily digestible format for a lot of people. Think about Leap Motion, would it have nearly been as interesting without the impressive video showing you why it's interesting?