I understand. I think it could have helped if you had posted this with your own thoughts as a discussion of this and other similar services instead of the content from the newsletter (don't know if you did that, but the post reads like marketing material) and the link to a commercial product.

This post looks like an advertisement, and I would have removed it, but there are some discussions about the product itself (and its possible issues/pitfalls) in the comments, which might prove useful to some people, so I'm leaving it up.

I use Amex blue cash preferred for groceries, Amazon card for amazon, Walmart card for walmart (still haven't gotten used to ordering groceries online, so only getting 2% for instore purchases after a year), and pnc cashback for 1.75% every day. I'm looking for a better catch all card with better cashback or benefits. I pay off my cards every week, just to make sure I don't carry any balance ever. I strictly use it as a cashback machine, and for security.