Samwha electrolytic capacitors quality?

2 x capacitors @ 63V rating for a +/- 50v supply. Not sure what make they are off hand but most electros in this unit were Roederstein which I think were about as good as you got in 1981! ESR quite good in some of them but one or two were a little high ohms.
I think I might leave them then as there is no sign of leakage and the ripple at maximum volume under load is less than a volt. I just wanted to guarantee some longevity before I sold the unit on but I am not prepared to pay £20+++ for a single capacitor!
Not sure that a bad rep for Samwha would be justified but that is what I would like to know for sure!
Olly.