Honestly, I just fail to see what's so amazing about next-day delivery and a returns process that involves going to the Post Office. I generally expect that from most of the online retailers I use.
I accept Amazon may have set the bar and others have followed, so in that sense hats off to them. Other than that though, it's just a lowest common denominator retailer to me: dull as ditch water website, cheap prices for cheap things, quick delivery (granted). It's the online equivalent of Wilkos. I only ever go there for superglue and I use Amazon in a similarly sparing way. The last thing I bought was an elbow brace 6 months ago. I can't say I was blown away by the experience! Perhaps I need to push the boat out and look for sports socks or printer cartridges.