The best thing you can hear as an entrepreneur: you’ve got it all wrong
thenextweb.com
thenextweb.com
Whether you are creating value in a way that is sustainable for your customers (and sustainable for you) is another question. However, it's in our nature to improve each time we do something, so even if it isn't sustainable at first, it might become sustainable. Similarly, if it's lacking in some quality that the incumbents' customers love, you might be able to improve enough to please them. Note the two mights.
True unadulterated feedback is gold.
"We love your product. How can we buy it?"
"We just told everyone we know about your product."
"We'd like to acquire you for a ton of money. In cash. Up front."
"We've never had to deal with cust service since your product is so good." (my SaaS orientation shows there)
And: "thanks for making xyz, I've just recommended it to my friends"