Well, the ones that I have that will do 5S are the older ones. The one I'm running right now is the first one that I got after their release.

Am I to assume that I don't have to worry about frying anything as long as it isn't cogging and things stay cool? I'm really liking the way this 9XL ran with the 5S. I just took it out because I've already blown up two MMs running 5S, but that was in the Muggy, which is a good 3lbs heavier than the 8ight T.