[RTuesday]

The coverage is based on Cingular (on one of the pages, they mention a phone locked to Cingular will work). The coverage should be similar to 7-11/Circle-K, but the map seems a little worse than those (less coverage in the AZ/NV/CA area near Bullhead City, I-80 missing in northern Nevada, etc). Could just be an older map.

The really good point about the offer is the sim-only deal, normally hard to get, but the short expiry (and lack of published international rates so far) makes it less interesting.

They do mention roaming rates (4 x normal rate!) but don't show anywhere off-network that it will roam.