It’s great at small stores where you’re getting a bag or two. At large grocery stores or Walmart like stores it’s annoying. There’s never enough space to put everything, it’s easy to mix things up if you have to put things back on the cart, and it takes twice as long because you have to unload and load while scanning. A couple of the grocery stores near me have scan guns that you can use while shopping and checkout right from. Walmart has this via their app if you pay for Walmart+, but they still make you go to self checkout to finish and wait in that damn line, and they still block the exit wanting to check your receipt which can gather a line. I avoid going to Walmart for all but a couple items that are super cheap. Even then I’ve paid more elsewhere because of how terrible the checkout experience is.