Hey Mike,
I looked hard at the assault climber for a while, but went with the hand climber II recently. There just wasn't enough room for me on the assault platform, "unless" the seat was positioned folded against the tree. And the seat doesn't do that without some fair effort.
I love my assault hang on, it's one of the best pieces of hunting equip I own, but obviously the hang on model's seat folds "easily" out of the way when standing. And that makes it easier to function on the small platform.
My 2 cents