OT: used Mini Countryman, Cooper

[bil]

hey guys

Thinking of getting one, mostly for my wife, probably my son in 3 years...
Year 2011-2016

If you have knowledge or experience with these cars, please share.

key questions, specific to these two models (not a used car in general):
which year(s) to avoid
what are the most common issues
what to pay attention to when buying used

intention is to drive it under $5000km a year

Automatic transmission

thank you