I would make the trade. 2 classic b/w 90's pins for 1 Stern makes sense to me. I think tspp is good but not great, it seemed like I was always just shooting the upper playfield most of the time. I have had all three and sold tspp and fs but still have the rfm and will probably never get rid of it (it fits in a space where a full size pin will not and its my daughter's fave). There is a lot of great modes on rfm and very popular with guests and flintstones is a decent pin as well.