I am only familiar with the B & K product line.
I do know that Sencore, aside from also being way way overpriced, only supports their current model the CR7000. For the prices they charge, their support is awful. If the product is over 5 years old you're out of luck as they won't support it. They'll give you the old line, "Did we make that?"
Heath and Heathkit products are excellent, but I'm just not familiar with their rejuvenators.