I've used Instacart since the pandemic lockdown began, and I'm STILL using it--if that gives you any indication! I've always HATED grocery shopping, so spending a bit more to get groceries delivered is worth it to me. I still go to the store throughout the week sometimes to pick up a few items here and there. But I do the bulk of it through Instacart.
In all honesty, it
can be hit and miss. There are certainly instances where a shopper has forgotten a few of my items (or a whole bag) in their car. Or times where the shopper ignores your "backup" choice and just issues a refund without asking you. That said, Instacart customer service is top-notch and they usually issue a refund for any forgotten items VERY quickly.
But many shoppers are amazing and really go above and beyond!
I've found the more specific I can be when placing my orders, the better the results I get. For instance, if I'm requesting something that I know isn't a "popular" item (like I enjoy those Perfect Protein bars), I'll mention in the notes where they are usually found in the store.
I also (for some reason) usually have better luck when I place my orders at Aldi, as opposed to our other grocery store nearby (Giant). NO idea why!