The cage is certainly bigger and more cumbersome than just having a lens mount on a phone case, but it will also fit any phone rather than being specific to one, and includes multiple mounting points for tripod, microphone, light etc. The integrated grip is also very handy. The anamorphic lens is also lovely, I really enjoy using it, which is the best recommendation for anything!
I must like the products ok, I've just ordered the Telephoto and Macro lens to go with it!