Yes...unless you wanted longer runtime and softer light, for close up work, for example, and then you'd want the MN02. So perhaps both?
And then, what if you want to put an incan back on the E1? You'd then need a replacement for the blown MN01. Just a roundabout way of saying all three have their uses in your flashlight armamentarium.
But, if I were to get only one, it would be the MN03, 'cuz it's brite! And the KL1 is good on the E1.
daloosh