I don't know much about the kick-eez, but have heard good things. I like a Limbsaver, but the Pachmayer Decelerator on my 416 Rigby also does a great job at making it comfortable to shoot. I don't think you would go wrong either way. I would be willing to try the kick-eez if it was priced lower than the Limbsaver. Just my 2¢.
I've was using the Decellerator until introduced to the KickEez, all my rifles now have the KickEez. I do not know what the price difference is, if it saves my shoulder and allows me to shoot more comfortably for long periods, whatever the price it's worth it to me.