I make a purchase and it normally shows up the next day. That's unreal (I'm near a distribution center, so that's not the normal 2 days stateside).
I need to make a return, I just click a button and bring the open box and item to any UPS store (there are 3 within 3 miles). They will package it for me and ship it. I just show them the UPC code on my phone with a ripped open box and an item.
They have a good system. This may be US only, but it's easy to understand why they are so popular.
I have separated myself from Google for privacy reasons (except a few things...) and try to avoid Amazon where I can and support local shops. So this isn't advocating Amazon, just pointing out that their competitors usually can't compete on returns and shipping time.