We know how effective a pitch man Mr. Shatner is especially with Priceline ads. He uses satire to great effect . He also has great mass appeal. An add with his imprimatur for Sodastream could do wonders for the stock image on may fronts: costs savings, health advantages, convenience and environmental friendliness that could all be highlighted in one effective ad. Perhaps one that would be devastating to the competitors (Coke, Pepsi) using a tongue and cheek or satiric approach. Never underestimates the effect of whimsy to get a point across.