Who are your competitors? Once you find them, if they are public companies, check out their 10K and other SEC filings (using EDGAR or Lexis Nexis) for the company's annual report and more. Use your industry's NAICS code to search by industry in these databases.
How do customers view the solution they are using now? Are satisfaction studies available on your competitors' products? Try searching "[your product's name]" and "satisfaction." Some databases may have a subject heading for customer satisfaction.