Got my first 4 dash buttons today. Toilet paper, paper towels, trash bags and clorox wipes.
Setup required the shopping app via the phone. Annoying, but understandable--the phone app has native access to the wifi network, whereas communicating with the button via a browser would be more challenging. Otherwise, the setup was really easy. Since I got "branded" dash buttons, once I connected the device, I got multiple choices of what exactly I wanted to buy in that brand.
The choices are all "bulk size" orders. 16 or 32 rolls of tp, 8 or 12 rolls of paper towels, etc. I don't mind, because I usually bulk purchase these items at Costco anyway. The prices, at least so far, are 2-3 dollars more than a comparable amount/product from Costco, but all have 2-day shipping. I don't mind paying a couple bucks for that convenience.
Called my wife into the office and had her hit the toilet paper button. Got a notification of the purchase on my phone nearly instantly.
All of the items I got a dash button for have a standard storage location in the house for the bulk purchases, so it'll be easy to open the pantry, for instance, see we're low on paper towels, and hit the button that's mounted nearby. There'd be no reason to hit it if there's a bunch of paper towels in there.