[jarrett]

My experience with AdWords has been that it's hard to get enough traffic to give you meaningful data about interest or conversion rates.

That being said, if your particular keywords can bring you a lot more clicks per day than I've gotten, it's probably worth a shot.

I think if you really want quality feedback on your product, though, you'll need to reach out on a human level. Contact everyone you know, people you don't know but who might be interested, etc..