I like FA. I average about $200 per month from them. While not a lot, for the work involved on the jobs I accept, I don't find it too bad. It is easy for me to take on a few low paying jobs while I'm out on a route. I even have done well at the jobs where you must locate a specific UPC. Of course that said, the UPC jobs, just like the Halloween jobs mentioned in this thread, would not be worthwhile just going out on a whim and doing. Even the Halloween job states only accept it if you happen to be in the store. If I'm in one of the stores already, I have no problem snapping a picture for a contest. It takes all of three seconds.
I think it was back over the summer FA had a TON of jobs where you had to go into a store and look for and scan barcodes for several dozen products in a given category. If I recall correctly, you had to take photos, too. There were like ten jobs (all different categories) for each store. I think the jobs started at $8, but I didn't attempt any until it reach $12. I attempted several times to complete jobs, but there were no directions on what to do if a store didn't have a specific UPC. I knew if I could not scan a bar code, I'd run the risk the job would automatically be denied without even reaching an actual person. It was also no way to comfortable take the dozens of photos they wanted. I think the jobs ended up paying out $25 each right before their deadline.
Just last week I did a product review gig. Not only did I get reimbursed and paid for the gig, I got $15 from Ibotta for submitting my receipt through their app.