After owning the Amex Cobalt for 1.5 years and seeing a couple of us mention it in the forum, I decided to write a more comprehensive, firsthand review of it.
In short, at 5 points per dollar spent at grocery stores and restaurants, this was the first card with an annual fee that I decided to keep past the first year. Note that 5 points does not technically equal 5% cash back for the Cobalt. I tried to give a more practical review than what I usually see with online credit card reviews, which just say "everything is great!", but hopefully I didn't get too caught up in the points calculations.