I've installed and worked on several new woz machines including one of the first prototypes put on location. JJP has had issues and so have the games but the one thing I can give them an A for is after the sale customer service. Never had a problem getting help. Have had many new parts sent quickly and free. Screwed up once myself and they were very understanding.
The location game at Marvin's in Michigan has had many many plays and is still chugging along and earning great. Overall downtime is low...maybe a couple days over the past year.