Namba-san's sushi is definitely small, and as a result the standard course includes over 15 sushi (actually, 18 on my last few visits), compared to many other sushiya that might serve 10-12 before offering add-ons. While diners are presented with the day's nigiri menu at the start of the meal, I've also noticed recently that at least one and sometime two "bonus" nigiri seem to be served. It's really nice to experience such variety in flavors without getting overly full, and the small and slightly round sushi shape is almost jewel-like.