I confess that I too used to be a transpose addict. However, I have learned to play fluently in the majority of my keys now. I am still working to be comfortable in a few. I learned the hard way, the button will eventually fail you because if you play with professional musicans who modulate whole and half steps you are in trouble. Also, let's say you visit a church and you don't have your board. Well you are asked to render the music but all they have is a regular piano. Now what are you gonna do? If you play then you will make a fool of yourself when they sing in a key you don't know. If you decline, you will be considered rude. I used to think it was hard to learn to play in every key. Thanks to some of the wonderful musicians here on LGM, I learned about music theory and it has made a true musician out of me. THANKS TO ALL THAT CONTRIBUTED.