Even without the chatty (but friendly) cashier, lines were still long. I would recommend putting a star or something on the menu to indicate best sellers. The wait to pay is longer than the wait to get the coffee.
Lavender white mocha is popular, my friend ordered it and said it was good. Lavender was subtle and she was happy with it.
I've been to three different coffee shops in LV and ordered Nutella lattes... All 3 disappointed me until I tried the one at Bad Owl. It's a bit too sweet for me, but bad owl captures the Nutella flavor perfectly and blows out the other 3 coffee places, illumilatte, sunrise coffee, and the human bean.