Just thought I'd put my 2cents in.
I run ARB's. When I hit the trails I usally lock in the rear, unless it's really twisty, and leave the front open. For the most part I can't tell when I'm in 2wd are 4wd as far as stearing is concerned. When I come up to an obsticle I just push a button and now I'm locked front and rear. Once I'm through I push a button and the fronts now open.
I've heard the lame excuse about "Now I have to think about locking up the front". It's no different than remembering to put it into 4wd. Once you get use to it, it becomes automatic.
P.S. Another bonnis is that you now have "On board air". It's not fast but it's come in handy with my Jeep friend on the trail.