At this point it's a question of how cheaply they can scale it up and how much you can improve the efficiency. Looking at some of their numbers they block ~30+% of the light to gain ~1.3% of the energy you are better off with smaller windows and a high efficiency solar cell around the window. AKA 10% smaller windows block 10% of the light + a 20% efficient solar cell = 2% efficiency. Granted, there is probably a market even in it's current state.