A few days ago I fitted sets of zippy microswitches to my 360's without Restrictors or upgradded springs. And I've gotta say I love the feel of them now. I didn't plug them into anything, it's just for the feedback feel and sound that the microswitch levers produce, but well worth it at .40¢ a switch. I might fit octogon restrictors at a later date, but maybe not.
I'm comparing this to the Wico, j-Sticks, GGG True Leaf, and various 1980's Nintendo sticks I have.