I have a friend who has full sets of so many types including Signature circs, ChiaGoo, Hiya Hiya, KP, etc. and now she's bought a few of the new carbon fiber needles (not Webs brand) to test. I think she's made of money.
I have a few of the Sunstruck and a few of the Harmony and like them a lot. I prefer the plain ones, but I bought the few Harmony a few years ago. I'm using them now for the hats I've been making on Encore. Lovely!
Unlike your friend, I can't have them all so I will enjoy the ones I have. I think it's great that there are different needles so we each can use the best we can get for our individual knitting styles.
Happiness is catching that dropped stitch while it's still fixable..