I had a kopykake years ago, and I hated it. The device was huge, sizing was a matter of trial and error, and the image was always dim and difficult to see (so much so that I’m still not convinced it wasn’t broken.) Plus, it was crazy expensive. Now I use a Pico in combination with the Camera Lucida app on an iPad. I can take a picture of my sketch, resize it instantly, even mirror the image or reverse black and white (which is great when piping on a dark background.) The image is clear and easy to focus, even when the lights are on. And it was significantly less expensive. I highly recommend it!