Better have a Smart Phone!
If you are designed any marketing piece with a QR code I recommend that you test it out before you send it out to the masses.
1. Reversing QR Code
I designed a piece where I vectorized the QR code and reversed it so that it was white on a solid color. I would also check when using on colors that have the same hue/value. Result: It doesn't work!
2. Let the user know where it takes them
Like I have in the sample above, "for more info go to our website". It is better to inform and not frustrate.
Please let me know if you have any other QR tips & tricks.