I can equate Stern 'quality' to car guys on this forum. Bally/Wms games were GM quality~they built millions of them and they were workhorses. Yes, every once & awhile you'd get a dog but for the most part decent quality. Older-era Sterns were of Ford quality. Decent, simple to fix machines, not quite as durable as others, but hey, you expected that. Data East/Sega machines were the AMC's of their era-put together like shit, looked the same and scrapped when 'used up'. Modern-day Stern's~well, let's just say we'll put them in the Dodge category and leave it at that.
Doc