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Clever idea, just a bit of a shame that its going to annoy the user whilst using the computer.
If it could be inserted the other way around, so that the padlock was behind the screen then it would be a very good product.
Actually, the device fairly unobtrusive. I doesn't block the screen, and if positioned correctly, doesn't interfere with any of the keys. It's not perfect, but it offers a simple, inexpensive first-line security solution for MacBook Airs. There are very few physical security solutions available for Airs and all some some positives and negatives.
Image
Well from that picture I think it looks pretty ugly and unsightly. Sorry, I like ideas like this that show an attempt to find a solution to a problem (true product design) but I think it could be improved quite simply. Have you considered options for reversing it, somehow having a flat stop on the top where you currently have the pad lock and moving the padlock and shackle so it ends up behind the screen?
The problem with Macs is people buy them because of their aesthetics (amongst other reasons), so a product designed for use with a Mac must complement those aesthetics.
That may sound harsh, but having done a degree in Industrial Design (yes thats true) I know that critique is essential but not always easy to receive.