Edit: thinking more about it, why not have the whole visible spectrum be tunable, so that you can create window blinds any time you want them, and increase energy production in the process?
Anyway, the energy from sunlight is for the most part visible light so you can't really use most of the energy without also blocking visible light. The best option is automatic shades which make the outside look dimmer but don't totally block the view.
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.
That would be a great thing to have. Does give a whole new meaning to 'rolling blackout' though.