Wow! the price is $125!
Ideal V. is about $85 when I bought it.
Well, the millimite has a slightly lower Cv than the Ideal. And, let's face it, it's Evilbay. Some of the really good stuff is priced like the stuff yardsalers drool over, and some of the real garbage is passed off as gold and precious gems. And, either way, it all depends on what you're looking for.
I have a BM series Swagelok valve that's sold new for $250. And I bought it used for $13 shipped. And, since it might actually be useless for what I need it for, I might just sell it for what I bought it at.