I've had two 4001s, and rate them as "unique". Both were (are?) great basses - if you like Rics. My current '79 model was my go to bass until someone sold me a Warwick with best neck I have ever played
I use a pick, so the cover is not an issue. The sound is unique, and the neck is slim - perfectly playable. I have not noticed neck dive, but will admit that the machine heads are not smooth and regular.
Hope that helps.