I think I've used them a few times over the years. Probably when a coupon was available to make what I was buying(wet/dry food,Cosequin)) cheaper from them than from Amazon or Petco. Amazon is my go to site but not opposed to Chewy or Petco if able to save a few $$. You can always cancel the auto reorder after you get your first shipment.
figured I'd mention it in case you were a PetSmart rewards member and they accept it. Don't think I have been in a pet store in maybe 5 years ! Dog stuff gets bought online and cat stuff at vet !
Daughter swears by them and says they are good she has to Monster Dogs and says there prices are some of the best for what she buys...
Our dog is on a special diet due to a very sensitive stomach. I've been using Chewy for about a year, and as far as I can tell I would not be able to buy this food cheaper anywhere else. I use auto delivery, which is easy to edit if you need to change the date of delivery. I haven't bought anything else there, but I know our neighbor thinks they are great. Thumbs up from me.