Hey Gou, here are some ideas: Be sure that your uniforms contrast well with the floor and background. I bought some videos from Arnis.org and had a little problem with some stances due to the fact that his pants were black and he was on a black mat. Another thing about their videos: there was a TON of useful, well-explained info, but they lacked some of the exciting, passionate kenpo demonstration of techniques that would've made the videos top-notch. I still would recommend them to anyone. Their knowledge of kenpo is huge and they don't hold back the info. In many ways I'd much rather have that than just a bunch of pounding. But a little pounding would've helped the cause a bit.
Also, I don't care much for the slo-mo. Maybe one shot of it slow, but most VCR's have a slow button or a frame-by-frame. Tabatabai and Sasaki's Panther tapes show the thing (form, technique, whatever) three or four times slow. I'd much rather rewind it if I want to see it that often, versus having to fast forward through all the slo-mo. Plus, when they say the tape is 60 minutes long, it really is nowhere close with all of that agonizing slowwwwwwwmooootioooonnnnnnn!!!
Production value: Don't need it as long is the picture is clear and the sound is good. Throw out all the fancy intros, cuts, fades, dissolves, etc and spend the time and money executing and explaining.
Good luck!