are the wizard edition monsters worth it?

They are gold and shiny and in theory somewhat stronger than their non-gold counterparts. But nothing mindblowingly cool or overpowered. If I somehow don't end up securing a Wizard's Edition, I would be willing to trade for or buy those DLC codes but that's me personally. They are not a big deal. But we have no idea if they'll be available later. They might sell them down the road in an attempt to squeeze more money out of the localized markets, but in the Japanese version there is still no way to obtain them other than the original promo.