Back in the day, I owned a '57 Mercury with a pushbutton transmission.
In 150,000 miles, that's the only thing on the car that gave me serious grief. And it only acted up once, but that was when I was on a trip, driving through Indianapolis in a snow storm. I had managed to get it into "Drive" back down the road a ways, and I pulled into the Lincoln Mercury dealer in Indianapolis at noon on a Saturday. All I could see was all the service people walking out for the weekend.
All I could do was get a motel room. They replaced the pushbutton unit on Monday and I was back on the road Tuesday morning.