When we bought out ledge lounger chairs, I also wanted to buy the umbrella ice bin but the sales person talked us out of it. She said it is meant to be used only if there is an umbrella sleeve in your shelf already, and the ice bin itself was not enough to keep your umbrella in place.
Since our umbrella sleeves were in our decking vs tanning ledge, we just put the umbrella there and saved ourselves the $. Note this was 3 years ago and I see some different variations on their website that may be better as stand alone umbrella bases for ~$1,000 ?!?. The one we were looking at was ~$400.