Sean Jacobsohn of Emergence Capital has just published an excellent post titled "Here’s how to find out if your cloud startup has product-market fit". It's easy to fool yourself into thinking that you've found product/market fit, and Sean's post mentions some of the most important of these pitfalls. "All my customers are fellow startups in my incubator class" might be an obvious one, but there are also less obvious ones. :-)
I like Sean's article so much that I've turned it into a Typeform.
So, if you're curious how your SaaS startup is doing in terms of product/market fit on a scale of 5-25, answer these five questions!