It's quite different in most regards: I'm super-tired all the time, need a nap every afternoon, my endurance is extremely low (lifting a kettle feels like lifting a weight, climbing the stairs feels like climbing a hill) and simple activities tire me out waaay more than they should. If I do anything remotely strenuous, then it does kind of hit me like narcolepsy - within the space of a few seconds I become extremely tired, like I've been drugged, and I have to sleep.

CFS remains a diagnosis of exclusion, and it's quite likely that it's a label that actually represents several conditions, and people are affected to varying degrees - some are bed-bound, for example.