I drive 2014 countryman.
Reliable- after 40k km in 2 years, no major problem just service when the car shows signal. Only problem is during long and heavy rain, there will be a signal showing my window is not closed. Claimed for warranty, change the power window motor 2 times, still the same. I dont bother anymore, let it be.

If you can afford, and you like Mini style, just go for it.
Otherwise there are tons of different car more worth the money.

Btw, have you test ride it? With run flat, the suspension is tough, and the tyre noise is loud. But after I changed to normal tyre, it is better now.