I like diners and they're few and far in between in Calgary nowadays.
This place is set up cafeteria style - order (eggs benny!), pay, grab a number and (hopefully) find a table.
I don't think there's ever been a time here where it it's not busy. And there's no reason it shouldn't be - food's decent (the hashbrowns could be more crisp), service is efficient and it's clean.