I'm not a big fan of this show. I have only seen it a few times.
I don't like how they stop a video frame with a viewfinder super-imposed and we're supposed to infer that this is what the photographers' pics look like. I want to see the actual photographs that were shot.
I also find it a bit boring when the pro photographer takes the celebrity-guest photographer through the photo one step at a time. Tips are fine, but let the guest dig up a little creativity of thier own. I want to see the pro's photo and the celebrity-guest's photo. I like seeing the differences in several photographers' use of the same subject matter. And personally, some of the most exciting photos are taken by complete amateurs who don't know any better, and they smash the rules and come up with something brilliant.
And the final thing is that there is no way I'll ever afford that gigantic, bazooka(Canon) lens. Occasionally they need to throw in a guy armed only with a 300mm f/5.6 and a teleconverter.