If they're going to remember the problem, make sure they remember it fondly.
The only way to go further than you've been is to take an extra step.
Sometimes we become so expert in our own domain, we forget that customers may be less familiar.
You do more for yourself when you forget yourself.
If you want to be the best, find the best in others.
If your customers have to ask you for it, you haven't been thinking far enough ahead.