5751 Triple Mica - really that good?

I have a Jolida JD-100 cd player with Parts Connexion level 1 mods, plus addt'l mods. I've tried Mullard and Telefunken 12AX7 tubes and do like the overall sound. I've been considering triple mica 5751 tubes, thinking it will take the overall sound up another level, but they are costly IMO relative to what I've paid for the 12AX7 tubes.

Are they worth it? Anyone with a JD-100 have experience rolling tubes including 5751s?

Thanks!!!!