By only sending you questionnaires you are already qualified for, Pinecone wastes far less of your time than many sites which require you to fill our qualifying questions before starting each survey. However some users have said they don’t receive very many surveys, which could be a consequence of their careful filtering. Equally the site retains the right to remove you from their panel if you no longer fit their desired demographic, so make the most of your membership while you have it!
Something unique that MyPoints offers that most other similar companies don't offer is the ability to earn cash back on some in-store purchases at select stores, along with their online paid surveys. Also, although their online store cashback rates aren't the highest in the industry (ironically, Swagbucks beats them on several offers), they do have special offers that other companies don't have, such as a bonus to sign up for Amazon Prime.
Ipsos is a funny name for one of the oldest and largest global market research companies. They were founded in 1975 and if you follow US politics, you'll recognize them partnering often with Reuters to produce approval surveys of Congress, the President, and other notable figures. They're headquartered in Paris, France and publicly traded on the Paris Stock Exchange. They have revenues of over a billion dollars – Ipsos i-Say is just a small piece of their business.