Ever since I put in the Jantzen's into my speakers I've been thinking about why do they sound so good. I really think it's got a lot to do with damping and vibration control. Once you get them in hand, you'll see what I mean - they are like little hockey pucks, very stiff, very damped. The other thing that is better is the dielectric. Wax/paper just sounds better than plastic based dielectrics IME. Even better than teflon. No other inductor really does anything to address these areas like the Jantzen's do.
Anyway, let us know what you think, once you get them. When I special ordered mine, it' only took a couple weeks to get them in-hand.