Hi Kyrill,
Thank you for your post on Bybee purifiers.
I have not tried them; nor do I know anyone here in Australia who has.
However, that is not to say they do not work. Jack Bybee is no fool and I assume there is some scientific basis to his claims.
Sadly, then, and in the interests of an open mind, I cannot advise you.
However, I can say that Black Gate caps are very good, and particularly low noise. But then Nichicon Muse are very good too, though not so quiet, and about five times cheaper!
Cheers,
Hugh