Love them. Bought the Mrs a High Up! last year and it's a great little car, I prefer driving it on my commute then my motor.
The heated seats are great, there's loads of room inside for the size of car, the media screen is fantastic with sat nav, bluetooth, sd card, trip computer, etc. You can even download more apps on to it. Seats are comfy and it generally feels solid and bigger than it is. Useful split level boot thingy majig too.
Went for the 75bhp version for a tiny bit more poke, still returns 60mpg. Considered the Citigo but the equivalent model was only a couple of hundred cheaper which we'll probably see back in residuals.