I've spent some time on this, and it requires an adjustment in typing style, but it works. It's the ultimate portable keyboard (and makes colleagues jealous) at a good price. True, there are some difficulties with bright overhead lighting or sunlight, but I find that moving the keyboard or using piece of paper to project onto helps.
This is perfect for large hands that regular keyboards are too small for. I hadn't thought of it until my Army Son that I gave this too pointed it out to me.
This keyboard woks great, I'm typing this review with it now and I can type as fast as I want and no problems. The mouse part works great also. This thing is tiny very portable, will fit in your pocket with no problem it's not much bigger than a pill bottle.