I was with them for a while - couldn't remember how long but I was able to accumulate enough points to redeem a nice baking dish set.
It was tedious, and lot of work if you shop a lot at Walmart. For most the stores, the scanner can read price automatically, but not for Walmart - you have to enter price for every item you buy manually!
I didn't encounter any problems with the scanner scanning, just a couple of times had problem transferring the data (I used telephone to do the transfer), and had to keep trying until it went through.
After I while I had enough and returned everything. But I do like that they have mail and online surveys that were very easy to do.
Overall I think it's a okay program. I think it's a pretty good gig for a 13+ years old.
ETA: in case anyone want to sign up, here is
sign up link to the Homescan program.