Re: PokeDex PRO 3D
I guess it's more of a fun little add on than anything seriously useful. You can access all the information much more easily online. It just depends if you think it would be fun making photos or looking at the 3D Pokemon, I guess. If you just wanted it as a reference, you're probably better off just using Bulbapedia or buying a guide book.
I reckon they should have given it away for free or at least with purchase of Black or White 2... I guess they know they can make money off Pokemon though =/