6102 I had a similar experience, as I imagine a bunch of people did, a while back. The good news is the units did arrive finally. I think they are a great idea but are not easy to implement into your program. Being that they cost $200+ most clubs can only afford 1 or 2 pairs.
So you have to make extra time and space to use them and only a couple kids can use them during one time.
Some of the stroke examples are very good and some I don’t like. All in all, if you have extra money and the ability to have a limited amount of swimmers use the pool at one time then you they are worth trying.