Took delivery of GNR le last April. I have had issues with the spotlights a light board the shooter lane board and of course the playfield pooling. In every case JJP stood behind there product and shipped me out parts for free even as recently as last week for the light board. Not happy about the playfield which they only resolved with sending washers but I can live with it. So in my experience there service is on par with stern, I can’t comment on CGC because I have never had anything break on there games yet.