A bog standard -4 without pendulum absorbers fitted will rattle your fillings out PDQ, especially going through translation on landing. Even if expertly tracked and balanced this machine is tiring to fly in for any length of time.
LS blades plus pen dabs decrease vibration a lot, also add 5-10 kts at cruise but are increadibly expensive and are prone to leading edge debonding, (at least the early ones were).
Over all it's built like a brick ****house, very manoeuverable and if well maintained reasonably reliable. Saying that though it's showing it's age now....and, yes it is ugly but so are some of my other best friends!