I have a little time in the 60-601P (very little). I really enjoyed the way it flew, but, yeah, loading unloading and the door configuration itself. No thanks. This was at a 91 shop where it was flown by full time and per diem pilots as opposed to owner flown. I might feel a little different if it was just to get in and go.
Dealing with it and pax was a little odd.
As I recall it was prone to fuel pump problems. We got stuck somewhere for a few days waiting for one to be delivered and installed. It happened often enough that it became policy to carry a spare on board. Later I think they changed that to one in the hangar that they could overnight to the plane if needed.
Eventually it failed an inspection (something that had to do with the tail structure) and the company got rid of it. I don't think it's flown since.