I have in fact used myoplex. I don't mind it for an occasional "extra" that I eat after a hard day. I.E. a
myoplex when stopping to camp, and then a regular dehydrated dinner a bit later. however, I don't find a myoplex any lighter than a dehydrated "real" dinner.

knowing from experience however, I can get pretty un-enamored with myoplex pretty quick. It's also pretty high protien, so not really what I would take while active to avoid a bonk.