I've finished watching S1, enjoyed it. In one episode, a mobster lived in a mansion, that looked like "stately Wayne Manor" (from the Batman tv series)from the outside, don't know if there was access to the bat cave or not.

I've started on S2. I like how they handled his transition from working for a detective agency to his own PI business. In the first episode, his client is a deaf woman. She read the lips of a kidnapper making demands on a pay phone. In an exchange, she shows Mannix she is soon to be married and inquires if he is married:
Mannix: "No, I'm not married. ... Why? ... Well I guess I've always been a loner. Even when I was with Intertect. ... Intertect? Oh, well that's a big detective agency. Big building, y'know, lots of machines, computers , all the time tick, tick, tick, tick, all the time! Well one day, I got fed up and cussed at the machine. I think I heard it cuss back, so I quit. Now, if I can't get along with a machine, just think what would happen with a wife."
I liked the "kustomized" Toronado he had in S1. The next 2 seasons are the kustomized Dart GTS 340, after that it's Cudas for 3 seasons, a Challenger 360 Coupe in S7 and in the final season they have him driving a Camaro LT and an Impala convertible.
For vehicles, parents had a '73 Olds Cutlass, when I started driving. My first car was a used '82 Cutlass with T-tops.