Fair trade value, depending on what you want its a good trade.
Like said above the geo+ is fool proof, it doesnt shoot the smoothest or the quietest (kinda like a geo 2 with more pop). The features are also a lot nicer on the Geo+, lcd board, super customizable trigger, lots of toolless stuff).
So it depends on what you want. The PM8 will shoot the best out of the 3.