I got this video because the ideas behind it spoke to my problems. I'm in pretty good shape, took some traditional swim lessons, then couldn't figure out why I got exhausted after only 50 yards of swimming. Total Immersion is not only a radically different method of teaching, it's based on a radically different understanding of where the propulsive power of freestyle swimming comes from: i.e., from the core muscles, rather than the arms and legs. The exercises in the video are clearly explained and justified, well suited for self-study at your own pace.
I do see one fault with this video: although it covers all the exercises you need in order to do the freestyle well and with minimumn energy, it does not make clear the difference in some cases between what you do during the drills and what you do when you actually swim.
I would also note that people learn at different paces. For some, this method immediately "unlocks" the secret of effortless, long-distance swimming. For others (me, for example), the road will be longer and will require more patient drilling, particularly to attain the balance in the water that is the essential prerequisite to swimming effortlessly.
I think any swimmer should be able to benefit from this video, particularly if your learning method is oriented toward patient, focused practice of technique.