Personally, I think as long as the manual vac is in good condition (any brushes in good condition or replaced, attacments not cracked), I would continue to use it. We inherited a Hayward SuperVac with our pool and used it without issue for five years. It finally got old enough that the plastic was cracking, so we replaced it this year. I don't know enough about the RayVac cleaners to say.
-- Pete