People are busy. Attention spans are short. They don't care nearly as much about whatever you are saying or doing as you think they do or should. Except maybe for your mother.
There are many conclusions that can be drawn from this inference. But the one that makes the most difference is in your effort to delay an introduction of a product or service until it is perfect.
Remember the 80-20 rule? It is a Universal Constant! Most of your customers don't care about 80% of your features. They don't read 80% of your website or user manual. They don't hear 80% of what you say. So don't sweat the details - throw it out there in reasonable form and make an impression!
BUT: sloppy isn't good. Misspellings are symptoms of carelessness or worse: illiteracy. So just keep it simple, brief, functional. As the guys at 37 Signals would say: "We believe most software is too complex. Too many features, too many promises."
Get it out there. Perfect doesn't matter.