I used to run Grizzly locker on the front and rear. Great locker, but I would mainly recommend for the rear, because a selectable for the front is always highly preferred.
Will it make the steering stiff in the front? Yes, it 100% will.
Would I buy it for the front if I was on a budget? Yes.
Would I rather save up a few more $100 for a selectable in the front? Hell yes.