I'm open to using something else. Both myself and my partner have abandoned Amazon as we no longer get items successfully delivered within a few days, usually it takes around a week... and we were both Prime members, living in West London.
Where Amazon screwed up is the home delivery network. It's terrible. I'm sure they pay their drivers by number of attempted deliveries per hour rather than number of successful deliveries. We live in a block of flats, and we just never manage to get a delivery within several days. Eventually the home delivery people figure out we have a 24/7 365 concierge, but that still adds another day to the actual delivery whilst we wait to be notified by the concierge.
This isn't even a once or twice thing. My partner is an academic and researcher and is ordering 2-3 books per week and 1-2 DVDs per week. Nothing got delivered within a few days of ordering, over a many month period. We have lost faith in Amazon so totally, that we no longer go to them for books, let alone anything else.
If Amazon offered Royal Mail, standard post... we'd both return.
As it stands, using Amazon is absolutely useless for us, nothing arrives when we need things and it's better to use almost any other supplier. Any supplier that uses Royal Mail gets a successful delivery within 1-2 working days.
How bad is Amazon home delivery in West London? Put it like this, Christmas 2013 we bought all our gifts from Amazon, Christmas 2014 we didn't purchase a single item from Amazon.
I don't believe we're a freak exception, so there's got to be a large market of people like us who will use anything other than Amazon if the shipper will just use the postal system.