It's a really nice review, but I think that one important aspect is missing. Using Tangent devices has a huge advantage over any traditional input device (keyboard/mouse/graphic tablet), it lets the user change multiple parameters synchronously, for example adjusting exposure and contrast at the same time by using two knobs. I think it can speed up the image editing by some margin.
Thank you! I agree with you, but, unfortunately, I had not much time to test the panels. It requires more experience with panels to work with two knobs simultaneously