It is strongly recommended to have advanced reservations.
If you have more than 2-3 people in your group, you need a reservation.
DI gets crowded, so make a reservation.
I have been using it now for 3 months and it saves me so much research. Reduces the need to call and double check every time.
How did I not know these places existed?! Atly's scoring is a lifesaver, now I can finally find THE spot without wasting time Googling my life away.