I've most likely drove your Clubman, The handbrakes on them are pretty shit. Such a godawful design. When the F54 first come out, The handbrake switch was the first thing I noticed and hated. They are that crap i've parked a couple up and the cars have rolled into other car or rolled away from where I parked it, to find it metres away 10 minutes later.
I agree with the pops and bangs, great fun. I do find they sound different to the F56. Also when driving behind them, you'll notice the offside tailpipe butterfly valve thing open and close.
I've drove lots of M3,4,5 & 6 the competition pack upgrade is very nice bit of kit. lots of carbon fibre everywhere.