I just got it recently. I'm borrowing it from the school where I teach - it came in as part of a donation of equipment. I have a 6x18 pinhole of similar design (hemispheric film plane) which inspired me to give this one a try. I think the 1:2 ratio is a little easier to make images with - the 1:3 ratio is just harder to compose for if you're not doing grand landscapes. This one also I think gives more distortion, which can be either a good or a bad thing, depending on what you're looking for.