It's amazing to me that they are still able to be so far ahead of any competition... in everything -- prices, shipping, customer service, selection.,
Um... they're not? Well, not over here.
Prices are so so. Sometimes they're more expensive, sometimes cheaper. There's not all that much in it. Once they got blocked from wide scale tax avoidance, their competitive edge mysteriously vanished.
The range is good compared to many other shops, though I buy quite a bit from ebay who generally have much more interesting stuff. I buy tool consumables and elecgtronic parts from RS, who have an excellent range too. But the competition isn't one shop, it's "the internet", because it's not like I drive from place to place shopping online.
For shipping... again meh. I mean it's OK, but nothing special.
For groceries, all the big supermarkets will hit a 1 hour slot reliably, including weekends (extra fee). All the even half way good clothes places have free return shipping. RS offer free next day on any delivery. etc etc.
Random computer parts sem pretty good on amazon price wise. Things like an SSD and one of those funny DVD drive caddy converters for holding an SSD.