PineCone Research is an awesome company! I've been doing surveys and product testing with them since 2014 and I still have yet to have any issues. I especially love that if you have any questions there's a real person that you can email and she emails back!
I enjoy my experience with Swagbucks. My complaints are that the repetitiveness of certain offers and also the the offers to download a game or some sort of app in exchange for Swagbucks tend to be links that either don't work or are to not safe websites