All the different versions of Rewards Network are covered in its own forum under the "Other Loyalty Programs" tab.
I use it frequently but not as often as in the past because currently the most you can get is 5 miles/$, (used to be 10) and the lack of extra miles incentives compared to previous years.
The restaurants in the program run the gamut from mom and pop greasy spoons to national chains (for example, Buca di Beppo) and sometimes some very high end places, too.