I thought that successors were upgraded models. Turns out I was wrong. RAM has been reduced to 512 MB(Duos 2 had 717 MB) and the processor is just 1 GHz(Duos 2 had 1.2 GHz). Add Samsung bloatware to the plate and you have a phone that a tortoise can outrun. Only advantage is the KitKat OS but I have seen people change the launcher to Nova irrespective of the TouchWiz version available because they just cannot stand the cartoony offerings of Samsung. I wont say any more. You decide for yourself.;)