It's an excellent type of machine head, it stays in tune very well, mostly because each tuner is held in place with the string-under-tension and not by 2 weeny screws in the headstock.
Agreed, you wouldn't want to be banging it against anything - but would you with ANY guitar? (A similar theory about a cardboard double bass - people said, "I wouldn't want to use it in the rain" ... to which the best reply was, "much in the same way I wouldn't use my real double bass in the rain either.") lol
Truss rod, I have no definitive answer. It's short-scale (indicating you might not need one), yet it's 12 string (indicating that you might need one) - I've seen a lot of photos of what appears to be a truss rod adjuster in the centre of the tuning mechanism, I've seen an equal amount of pics that show none.