Well, be only done 2 trips to London and back so far, and do miss the overtaking ability of the Z4, and I'm missing the extra 200bhp, but not missing the 27mpg
I bought the Z4 about 7 years ago with 9,000 miles on the clock, and have put another 140k on it since.
The benefit of the 147 is the 50+ mpg on the same run and the more relaxed cruise due to it's softer ride, and relative lack of power, meaning I'm not always looking to get past everything else on the road. It's not like it's any slower over the whole 4 hour trip either, as that's usually down to the traffic.
I've always had BMW M cars as my one and only vehicle (used to be e34 M5s), but wasn't doing lots of miles in them until about 4 years ago. Didn't expect this current piece of work to last this long at this location, as I normally move around with the job. After the 2nd year I started considering something different, but thought I'd miss the opportunity to go cross-country whenever I felt like it on my commute back home from London.
I'd probably be still pontificating if I hadn't had a twunt pull out & slam on, in the pouring rain, on the M42 just before Christmas. I slammed on too, but the car swapped ends as I braked into standing water, and ended up facing the wrong way on the motorway after grazing the barrier.
Still waiting for the Z4 to be returned from the bodyshop, so decided to buy a runaround instead of driving the boring, uncomfortable Vauxhall Viva that I was given as a courtesy car.
I'll be keeping the Z4 for weekend hoons, track days and 'Ring trips.