Saw the BMW i3 in Munich the other week. Fantastic car as someone at BMW has basically put their foot down and said "we are making an electric car and it will be made from carbon fibre"
The interior is also a lovely place to be with natural fabrics and untreated wood. It really shifts too from a standstill. The tyres do remind me of a 2CV or black cab though (if the latter they might be really cheap!) but maybe with the carbon fibre chassis and aluminium suspension that is all the width you need.
As for the Tesla S - I would love one. It is amazing how well they have got on with the Supercharge points in America. Basically 1hr charge gives 100 miles range (ie they charge at 100mph).
I see a lot more reliance on motorway services with electric cars but forcing people to take a decent break is not a bad thing. Yes it is going to make peoples trips longer so you have to plan more time which could be problematic for business users going up and down the country in a day but if I can get 300 miles range and maybe have to take an hours break mid way to top up the battery which adds an hour while I get some food and a drink etc then I don't have a problem with it.
The other thing Tesla have is rapid battery change which takes about 1 minute or something silly. ie a lot quicker than standing at the pump putting 40-50L of diesel in your tank.
The i3 is about £30-35k which is not cheap and the Tesla S is even more but for some people in some situations the i3 can save £200+ per month based on a new combustion engine car. But for most private buyers who don't buy new electric is not currently cost effective. Shame as i would love one.