I almost got sucked up on the whole 20 thing.. Then I realized that , as mentioned above I could just shoot the 2-3/4 inch shell or 3 " and also always retain the option of going back to 3.5. In the end there is no replacement for displacement.. And yes a light 20 handles well but recoils just as much as a heavier 12 with 2-3/4.. Its a fad I reckon especially since if its for a kid they are going to outgrow the 20.
In the end I just bought a short barrel for the 12 and a pistol grip stock.. to each their own I guess.