Mini is an interesting species. One of those cars where it will do whatever you want up to a point - and then it will kill you. Its a fine balance.
I've totally lost it twice in a Mini - both times in my previous Cooper. Once was deliberate. It was in a controlled environment and I'd just got my new Cooper Sport. I had no idea what it was capable of and I found out. Don't brake round corners...
A second time was certainly not in a controlled environment. Similar situation where I braked around a corner (this time forced) and span around in the middle of a road towards an oncoming truck. I was lucky. It's one of those cars where it will do almost anything if its driven properly. Accelerate at the right times and treat it right and it will really be awesome but the second you do silly modern car habits you'll lose it.
I've only ever driven a Mini with 13 inch wheels though...I'm promised good things when I put 10s on my Mk1 when I finally get around to restoring it.
Wont have the same snappy feel as the 13`s. But will have more grip.
I never experienced the whole tram lining torque steer issues that everyone talks about with 13`s. Even with a gas assisted 150+ hp.