Higher mileage seems to uncover a lot of deep seeded problems. Corroded electrical system, for one. My BCM and rear washer pump never worked right, despite servicing and replacement. That is because of corrosion, due to bad design.
Yes, day at set of one is not much. But mine adds to many other data sets. Especially considering high mileage just brings out the gremlins, I would just go into the purchase with wide open eyes. You might be replacing parts often, and you will al.oat always have a list of minor issues to accompany the major one that finally brought you in for service.
But hey, the smiles per mile, as you know, are huge. However, considering you already have a turbo Mini, the R53 might be a better choice for unreliable pocket rocket as its character is very different from the turbo ones.