Great answers so far but I wanted to add another perspective:

One of the assumptions that is core to surveys being valuable is that answering "I want this" and putting in your credit card are two different things. In reality, there is quite some difference.

In order to truly tell whether an offer resonates, nothing substitutes for the real thing. This is sort of off the beaten path for lean startup but has been used in quantitative direct response marketing effectively for decades.

You could easily be getting in front of real customers and following their feet, not their lips with the budget you have allocated for this survey. At .95/response you could most likely get more respondents as well.

By split testing - you can get insight into key benefits, price points and anything else you could possibly want with REAL intent being measured by conversion.

In addition, you can build a pre-order list and get a few steps ahead on your customer acqusition channel at the same time.

You'll need a bit of knowledge in CRO, advertising and copywriting but for something like this it's all 101 level stuff. Give me a shout if you're interested and need a hand!