Been pretty happy with my Cooper S.
Two big issues I have with the clubman - the rear viability like everyone else, but also the single third door. Its very small and I find makes a design mess of the passenger side of the car for little improvement in ingress.
I'm 5'10" and have no problems getting in and out of my Cooper S with sports pkg - you guys must just have old knees and backs

You should try and dropped Miata ...
Also, don't let anyone fool you, this car torque-steers pretty good (short of a Saab Viggen, but up there) unless you get a manual with the LSD (no LSD for us auto-dweebs

). Not fun when you are jumping around in traffic and hit the overboost while turning. The car is a good reminder that I am a RWD fan.
Also, I hope the brakes on a clubman are bigger than on my cooper S as I found them to be on the small side at my one track event. I was having trouble pulling the car down at the end of the big straight. Perhaps time for non-OEM pads.
Overall, fabulous handling, good looks, and remarkably useful - I'm enjoying mine alot (although I think I'd like a 135i better ...)
Cheers,
Dave