Bro-in law has one (he works for a fiat garage). It’s awesome. I borrowed his 1.3 diesel 4×4 as a courtesy car while the 500 was being serviced and it’s really cool. Not hugely fast but the engine’s characterful enough and can certainly pootle along at 80 “on a runway” quite nicely. It has a fair bit of body roll, but the suspension’s well sorted and obliterates speed bumps. High driving position is really comfy and there’s more interior space than you’d imagine.
The continental m&s tyres are a little noisy, but a set of 16″ abarth alloys with tyres (from people installing the esseesse kits on 500s) are so cheap on fleabay you could easily swap them out for the summer.
I’ve heard mixed reports of the twinair version: the engine’s a hoot (900cc parallel twin, turbocharged with multiair valve train) and loves been thrashed but the resultant lack of economy is pretty poor. Yes it’ll do 70mpg if you drive it like a nun, but where’s the fun in that?