There are too many reasons to list why they are a service to avoid at all costs, so will list just a few of the most important.
1. They don't acknowledge or pay the majority of offers you properly complete, especially if they are for larger amounts. I took them up on their offer to get a Sam's Cluib membership. Sam's Cluib was offering it at 50% off or a year for only $25. Additionally, CapOneShopping was offering an additional $25 rebate, thus making it free. I followed the correct linkm through their site and bought the 1 year membership. It immediately showed up on my list as pending. A day later, it mysteriously vanished. Emails to them were answered by bots that ignored my actual situation, merely telling me to wait 30 days and send them the receipt along with my "Trip ID #" from my pending list. But, of course that was impossible since it mysteriously disappeared. I wrote again to explain that fact and simply got another copy of the exact same bot reply. So, I waited the 30 days and wrote again, this time including the Sam's Club receipt and explaining the situation of the magically disappearing Trip ID#. That hasn't even solicited a bot response. It has been met with total silence.
2. A second major reason to avoid them is to avoid their browser extension that shows you if you can get a better price on an item you are looking at somewhere else or even if you can get a rebate from them. The problem is that they are monitoring each and every site you ever visit - major privacy concerns there. Then, when you do make a purchase, you inevitably get an email offer from them the very next day with an offer for the item you have already purchased. I have received as many as 10 emails from them a day!
They are obviously profitting by sending business to different merchants, but when it comes to actually crediting you for purchases, you can forget it unless it under a couple of bucks and, even then, you only have about a 50/50 chance. The largest "reward" I have been actually credited with is $1.07, while anything over that (and there are ones for $19.95, $25.00, $30.00, etc.) all remain in perpetual "pending" status and when you question them, you either get a bot that either ignores the issue or they simply ignore you altogether.
So, unless you want to get cheated out of what you rightfully earned, get mailbombed daily and have your web browsing privacy totally violated, I would advise you steer clear. It sounds good going in, but it's all a scam!
BTW, TopCashBack, another such service, is just as bad.