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VERY highly recommended. Using nothing more then a small piece of tool steel, he shows you how to make any size gears, from 12 teeth up to as many as you want. To do this with traditional cutters, you would need a complete set of cutters that would cost ~$200. In addition, he shows you how to make the process nearly automatic-- after the first time round with the indexing head, all you have to do is feed the stock, the rotation is done automagically by the cutter.
He shows you how to make both spur gears and worm gears, as well as all the tools, jigs & fixtures needed to make them. While he doesn't cover it in depth in this video, he shows you enough of his home-built rotary table that you could probably build your own after watching this video (he covers it in depth in another video).
I do agree that the video is a bit slow. In an ideal world, it might have been edited a bit. Regardless, the sheer depth, detail & quality of information makes this an easy 5 star video.
Very useful if you want to make trees in the same style as Mr. Goehl. Probably worth skipping otherwise. The video was well made and not boring, but there really isn't much information here that will be useful outside of it's very narrow topic. Even things like brazing and such are not really covered in depth, presumably since he assumes you have already watched his other videos.
I rented this based on the other reviewer's comment of the leverage bender, but was disappointed. The bender is useful, but also quite simple and not worth renting the video for by itself.
But beyond these criticisms, the video is called "Trees, Trees, Trees", and it definitely delivers on what it promises. You will learn exactly how to build three different scales of trees (all in the same style, though). Just don't expect to learn much beyond that topic. Rent some of Mr. Goehl's videos first, and if you like them then consider renting this one.