I tried it out at the Apple Store a few weeks ago and after about 10 min I got used to it and loved it.
Today I was at Best Buy and tried it out again, and it was tough again. It took me awhile to get used to it again, but I didn't like it as much as I did at the Apple Store weeks ago. Although, I should note that I had my backpack on my back, and the table was very low, so it was hard to hunch down and try to type essentially from a perpendicular angle, with my backpack on my back. Maybe that caused my discomfort using the keyboard.