Hopefully some of the Spaniards on-board can answer this one (or those who have spend sufficient "quantitiy-time" there), but I don't think they're common in Spain at all.
As a side not: When my ladyfriend came to the USA to teach 1.5 years ago (she returns to Madrid this summer) this was something she was SO surprised to see; the great number of buffet-style restaurants here. She said, very quickly, "No wonder you Americans are so fat!"
hehehhee.. I had to laugh....in total agreement. (I'm referring to the all-you-can-consume-until-you-explode type restaurants here in the USA and not the one-pass cafeteria style restaurants of course. Maybe you meant the latter and not the former. If so, I'll stop blabbering now and let others comment...
)
Saludos, MadridMan
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[This message has been edited by MadridMan (edited 03-06-2001).]