Not sure what you are looking for with your question. You will get a WIDE variety of answers with this one.
I don't have a problem with IPSOS. I only do certain shops with them. There will be those that complain. There will be those that are happy. I am happy with the shops that I choose to do. I don't waste my time complaining about what a company pays. I take the shops that are beneficial to me. I ignore the others.
They pay REGULARLY. It is up to you to decide if the fees they pay are worth your effort. Everyone has a different price.