It truly is a game changer. I often use it before the regular search now. And no joke, it doesn't just save time, I've had it find things that I actually couldn't doing manual search. The reason is because it often knows when there are alternative names for the same sort of product and so can find things that are rebranded or the like.

I agree with you that I'd love to know more about how it works. The citations to real supporting websites are generally very good (though I've seen a few mistakes).