I bought my i3 just under 2 years ago with 24,000kms, it just ticked over 80,000 the other day! Initially bought it (used) as the nursery runabout and now it's used 90% of the time. Great little cars. It can feel sketchy at higher speeds if it's windy on the motorway but you get used to it fairly quickly. I just added the road top carplay/android auto when I bought it for the main screen and i've not really felt it needed much else.
I'd personally avoid the 60ah and get at least the 94/120ah - it turns it into a round town car into a car that can go on decent trips. I've got the range extender as well but only used it a handful of times, never had an issue with it. The major gripe I had with mine was it was a UK import and for some reason it had halogens and not the LED's, no idea why they decided that. The are rubbish - I added some LED's to them (designed for halogen reflectors) made all the difference.
