I have had Gottlieb, CC and Williams EMS.
I had big brave for almost 10 years and 3000 home played games. I thought it was extremely reliable.
Had many CC games. They were fairly reliable but i did not think their assemblies were well built.
Had a couple of Williams ems. Each had a nagging problem that took me longer than i thought it should to locate and repair but after that they were very reliable.
All of these games were neglected for years and i went thru it before putting it into my line up.