I have only been to the Armadillo Palace when the bands are playing, so I can't speak for lunch or dinner, but the service is pretty spotty at night. Sometimes you can get your drinks quickly - sometimes not. I once sat at the bar with a $20 in my hand for about 15 minutes waiting for someone to ask me what I wanted. And I've had other people's drinks added to my tab when I sat at a table.
Pros: food is pretty good
Cons: service is usually slow and indifferent
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