I think you will find that those who say the CSV is a scam or even "not so great" don't actually have one and have never seen one. They just "think" they know how pump systems should work and are actually giving you false information. Since the CSV has a complete money back guarantee you won't find anyone who has one that isn't 100% satisfied. Lol!
You just said you can see how it "reduces cycling by having the submersible pump run continuously". So you answered your own question. Of course the CSV makes pumps last longer as running continuous is much better for a pump than cycling on and off.
The Jury is still out on how long the CSV will last, as well as how long they can make a pump last. The oldest test cases were installed in 1992/1993 and are still running. I have documented cases of other valves that were similar to the CSV where the pumps and the valves have lasted over 50 years. The CSV is just a simple valve with a spring. There isn't much to wear out. And what the CSV does for the system eliminates pump cycling, which makes the pump last longer as well.
You can't get "real world experience" from someone who has never seen a CSV. And I think you will find that It is not many or even "some people", it is just one idiot making multiple slanderous videos on line. That is what I get for trying to fix stupid. Lol!
Here are several hundred people showing pictures of their real world experience, and you won't find a single unhappy customer.
cyclestopvalves.com