This is my favorite cashback site! They are frequently the highest %. I've been using Active Junky for a few years now, and have received all my cashback.
I experienced one issue with cashback not showing up on my account awhile ago when they were starting up this site, and they were very pleasant & responsive to my concerns. I've never had any issues since. They send confirmation e-mails when you receive cashback, so it's easy to keep track. HIGHLY RECOMMEND.