I don't mind the fronts without hex, just gotta pop a couple bearings out when you wash them but no big deal. The reason I have 12mm hex's for the rear (thanx 13mashine) is because I want to try the typo in the rear.
Other than wanting a tire that requires a certain wheel I think the bigger hex in the rear is a good... I wish my Tekno had a hex that large for the weight of the truck and the ludicrous power that it has.