I first signed up with Bioscreen about three years ago. I've participated in quite a few studies since that time. The staff is friendly and professional. They keep things moving and work hard to be on time with appointments. They let you know in advance how many visits and what day the study visits will be on. This allows you to decide in advance if a particular study will work with your schedule. It's a great way to have some extra money for vacations or other little extras.