Nice, bending light to change your composition instead of bending pixels.
at 300$ for something that seems to work with most lenses instead of replacing them it seems like a tempting offer, wish I had some money to put into photography. So many cool tools/playthings. but at Tilt-Shift lens or adapter have always been on my wish list since I first discovered them. It's kinda of a thing we haven't adapter to use in 3D renders yet as far as I've seen really, us 3D artists should always look towards photography for composition tips and tricks.