Concept seems a good idea. However, tests are not well paid in comparison to other sites, ie; $60 for an hour-long interview compared to £75-£100 on other sites and market research companies. They don't seem to use your bio info to screen out tests which aren't relevant so you have to wade through many screeners. Customer assistance not present. I am quitting as did a $60 interview recently where the company said my comments were extremely helpful and my work experience was very relevant, (company selling fonts/typeface use to graphic designers). They then complained and said that my work experience was not relevant to the research and asked UserTesting for a refund. UserTesting do not support testers at all, totally confused after spending an hour talking to a company happily with good feedback but UT will obviously issue refunds to keep high-paying clients over protecting testers.