I signed up for it last year and ended up sending the machine back.
It's probably a good deal for families but wasn't for a single person.
Your earnings build up very slowly unless you do a lot of shopping.
Plus, I received the machine and the next day starting getting emails
and phone calls bugging me as to when I was going to start scanning.
This went on until I sent the machine, instructions, etc. back via
return receipt so I could prove I returned it and get them off my back.
I think you have to pay s&h on freebie items you get from their offerings.
What I was concerned about with it is you scan in purchase receipts.
If you pay by CC or debit card, some of that info is on the receipts.
It bothered me that thieves working for Nielson could be smart enough
to figure out how to get into my accounts or sell my info.