This is a major, well-established company, and they will pay, but they will do everything imaginable to rip you off so that they can line their own pockets with more money. I avoid their surveys like the plague.
Here's a few things they do. This happens way too often to be accidental.
They'll say a survey will take 20 minutes and it will run over an hour. They want you to quit so they don't have to pay you, so they'll drag it out and keep asking the same questions over and over. They already have their information, so they'll get paid, they just don't want to have to pay you.
They'll have a "technical problem" at the end of the survey. They already have your survey so they'll be paid, but you won't.
They'll blend 2 or even 3 surveys together. You'll do a survey, say, on automobiles and complete it, and then they'll switch gears and start asking questions about fast-food restaurants, and you'll complete that survey, and then they'll start asking questions about television shows that you watch. They'll be paid for 3 surveys and you'll only be paid for one. If that.
Here's a real doozy. This happened to me once. After spending over an hour taking a survey that was supposed to last for 20 minutes, having completed the survey and even finished the questions at the end that say something like "These questions are for demographic purposes only", THEN I get something that says, "We're sorry, you're not qualified to take this survey. You don't match the demographics that we're looking for." WHAT! I ALREADY TOOK THE SURVEY! YOU'RE ABOUT AN HOUR LATE TO BE TELLING ME THAT!
The screening questions are done at the beginning of surveys, not the end, so it's obvious that they're trying every trick that they can think of to get their surveys without having to pay for them.
There are some really good survey companies around, I have a few listed, but THIS ISN'T ONE OF THEM!