I don't know about other locations, but saying the service at Patis in Crown Heights is subpar would be quite generous to them!
Almost half an hour wait (place not crowded) for a Caprese Pressed sandwich (which was a total disappointment, it was SWEET for crying out loud, as if it was on Mezonos bread, but that's a different story). Also, menu had the sandwich at $16.95, but it rang up as $17.95. If not for the wait I might have not noticed. Many items on the menu are not available (not to mention that the menu is only available at the register).
My bottom line: Patis is only worth it (with 50% gift cards) for things that don't require prep.
@Dan @jj1000 I don't know if you have a contact there to share this feedback with, but if you do, I encourage you to do so.