Both of these provide ample feedback that you’ve hit the right key. The keys are large enough not to make many mishits, the keys light up when you hit them and there is a sound very much like the old calculator associated with the key strike. There is no way that the ipod’s touch screen can hope to compete with the legendary feel of the HP’s keyboard, but the one on the ipod is fine considering. The biggest difference is, of course, the keyboard. It is a little bit smaller, overall, than the calculator: the original is about 128 X 80 mm and the emulator is about 80 X 50 mm. I use it on my Ipod Touch (1G) and it looks and performs exactly like the classic calculator. I wrote about the HP 35S calculator a while back and even though that is my current favorite, I have to say that this HP 11C emulator is pretty darn good.
