Couldn't write it better.
IMHO Go800 is perfect for ONE TIME (or rarely used) calls, where I can't remember the number. If I use numbers often, I'll store them in my contact list.
Generic keywords is really the killer feature here. PIZZA, TAXI, CAMPING...
and of course ads for replacing 800 numbers. (if the signed keyword is not too long or complicated...if I need to read the keyword character by character, there's no benefit to the 800 number)