Yes, I have the BT Magic Keyboard and this week tested the Logitech Combo Touch. I'm a fast typist so I feel that the BT Magic Keyboard is the better of the two because of the key travel and its spacing between the keys. When I'm typing on it, I don't even think about it. I tested the Combo Touch with an Air 3, and I found that I had to make a few adjustments in my typing rhythm, but then it's also the difference of desktop (with the BTMK) and laptop (with the Combo Touch). I suppose you can get used to any keyboard, but for me the BTMK feels more natural.
It was a pleasant enough experience, but like many others who have posted, I had frequent disconnections, which made it frustrating and disruptive to even work on even short writing projects.