Didn't they use this for siRNA transfection in their publication? I haven't spend a lot of time looking at their exact setup, but the concept behind their model doesn't seem impossible to adopt into a mass-producible product that would be expense, but not prohibitive. While a lot more physiology needs to be studied before we can understand what kinds of drawbacks this might make, current methods of changing lipid composition or poking electrically-induced holes in the membrane (without a needle to fill it) have significant changes in the membrane structure. If you're studying membrane proteins/interactions this is a significant drawback. At least in this technique, you have some knowledge of exactly how big and numerous these needle-induced holes are.