There's no substitute for getting out there and selling to your target market, even if you only have a quick prototype. AdWords + Launchrock can be a helpful b

There's no substitute for getting out there and selling to your target market, even if you only have a quick prototype. AdWords + Launchrock can be a helpful baseline filter in established markets. But it won't tell you if you'd be successful in creating a new market. I'm personally skeptical of surveys. There doesn't seem to be much correlation between what people say they'll do and what they actually do.