I love videos like this! I'll bet you reach more people than you realize putting them out there too.
A bit of constructive criticism, graphics! It would add a lot if you had a few lower thirds giving me the basic information. First time I was watching the video, my girlfriend was yapping away in my ear, and she saw me watching it!
Second and as it relates to these particular knives, I don't think you mentioned at any point that they're stainless. This is definitely something you need to put out there.
Finally if you really wanted to go all out, you could do some action shots. Everyone loves action shots