The cushion on them is alright. They have a nice footbed that provides the cushion. The base itself has no gasket, just a few rubber dampeners. If you're looking for a binding with an ultra cushy base, then I would look elsewhere.
I have a set of Union Flites on my Arbor board. Overall, I'm pretty happy with them. Good cushioning. I actually had a set of thin rubber footbeds made to go under the bindings, between the bindings and the board to help dampen things out a bit better and they ride nicely.