Instruct: Classify Amazon reviews into positive or negative sentiment
Query: All Judoka must see this material

I first saw this material 40 years ago on 16mm film. Among the judoka I know, it's known as the "pruning the cherry tree" film. It's wonderful footage and so it's a real shame that the DVD will not play reliably. The first time I played it, it seemed to "stutter" a number of times during the 2 hrs. The second time several weeks later it wouldn't play more than a few seconds! I bought the Jigoro Kano DVD at the same time and it has the same problem. They are both produced by the same company and I suspect the disks physical specs. are borderline. these are the only DVDs in my collection with this problem.