I need to get one of those Squier Jazz basses. Sweet and cheap!
I prefer the push-push type over the push-pull. With the former you just have to be careful not to pull up on it when latched down (e.g., if removing the knob it should be up, or if you let some doofus friend near it - sadly I have one of those, I would never trust him near my Explorer now, he's always breaking my stuff but never pays to have it fixed)