X2 on springs & pins. More so, the springs wear with use, which will eventially lead to pin failure. If your lucky, you can pick the bits out, throw new in and continue to ride. At worse, it can cause the locker to break, leaving you stranded.
On the ARB, go with the upgraded ait lines. Well worth it. Also, as recommended by Gary at Petroworks, carefully sand down the machine marks/grooves on the carrier where the rubber O-ring seals ride. Doing this elminates a source of wear, and a point of air leakage.
You won't need to look far to find someone who hate lunchboxes, but you will be hard pressed to find many ARB haters. That says a lot right there.