Gosh; what a coincidence! We too saw Amtico at Expo (in San Diego though) just the other day, and were really taken by it's perceived quality, durability and value.
Right now we're looking into if it'll work with our specific needs (mixed underfloor of concrete slab adjoining plywood) as well as using an electric radiant heating system with it.
Good luck, and hopefully Bob will reassure both of us!