They are moderately happy with our solution. How should the customers approach the potential suitor?
Normally it's the other way around. You should give your potential buyer the contact information of a few of your customers, and you have to encourage them to contact them.
That way they'll care more about what the customers have to say about your product/service. Also, something I did is to encourage users to tweet about the service, and I just gathered all that information for the potential buyer. I hope this helps!