I have done numerous paid studies here over the past several years.
I have never had a reaction to products I have tested. They explain the process very clearly and make sure you are not at risk to have a reaction to products. They have always been on time or even faster than the time they tell you. I recommend signing up to their email list to anyone who wants to make an extra buck. Most studies are super easy!
I will dock a star though because there is never any parking. The building is super dingy and has a very sad feel to it. It's a good thing the staff is so nice, but I feel bad for them to have to work in that building all day. Have a small remodel and I will be back to give 5 stars!