EFS. All day, every day. I have 4" on mine. As Frank points out, 4" lift springs and 4" longer shocks to match.
No they are not cheap, but you know what cheap gets you! I got mine from Devon4x4 as the Polish chaps don't stock this model. Originally I got them direct from Oz.
Not wishing to teach you how to suck eggs, but in relation to damping you really only get to see how good they are when you give them some proper treatment. Otherwise, Halfords ones will do. On our Russia trip, we rocked back and forth so much crossing the mountains that after a few hours mine were almost glowing. I thought I'd actually lost the front dampers completely. They were steaming. After a cup of tea and some photo ops we were back off again and all was good. They didn't suffer at all from the trauma and are still good today. They're far from new having covered around around 30k overland miles. Not that many miles maybe, but hard miles fully loaded and bouncing. Obviously if mated to inferior springs, they're going to get a real workout.
I wouldn't have anything else now. I know Sam and Andy have full EFS too and they're fans.