Quoted from phalcon_2600:

JJP loads their games down with LOTS of Mechs and features, compared to Stern. Stern tends to Try to make you feel like your getting added value by including things that don’t add a lot of cost of the build, like art, special ink or Piece of couch ect... We still have to see what is to come from American pinball and Deeproot at TPF. So....it’s a great time to be a pinball buyer in the hobby. So I say wait until you see what everybody is going to offer before making a snap decision when you see JJP GnR for the first time.