I have just read a study (german) that applied Van Westendorp's Price Sensitivity Meter to determine a reasonable price range for a SaaS offering. Specifically, the study tried to investigate the impact of usage-based vs. usage-independent pricing strategies.
Put simply, Westendorp's meter works by asking 4 different price points from potential customers, at which they would consider a product to be too cheap, cheap, expensive and too expensive. The method seems extremely practical to me and it appears the required survey can be easily conducted with online survey tools. When customer contact information is retained or the customers are known, additional insights can be generated with personal post-survey interviews.
Have you had success conducting such a study? Have you found it useful and were the results reasonable?