No regrets buying it but no regrets seeing it go either .
In 12 months i covered just 1400m with 250 of those miles being the drive home from the south coast so 1150ish in a year , not a lot for me when generally 2500-4000m id expect to cover ( its a 3rd car / weekend use only )
They are a beautiful thing to own , for me one of the best looking Bmw coupes of all time but a sports car they are not .
No matter the bhp the sheer size of them prevents any feeling that they can be driven through the twisties & bends with any real feel or feedback , it actually makes the E89 feel nimble by comparison .
For the majority of my miles it was driven like you would a 5 series , wafting along looking at the scenery
to feel any momentum takes licence losing speeds . Once again like my 35is ownership the DCT left me underwhelmed & disconnected
& i;m convinced the 8spd ZF box in our F11 is better .Fuel ? well they like a drink of the good stuff that's for sure , best behaviour required to see over 30mpg with the average everyday pootling around being around 20mpg.
VED currently £330 for 12 months up to 2017 - after 2017 its a whopping £520 pa .
Buying & selling : lots of choice but lots of hammered examples , they are approaching 10 yrs old now ( mine was a 2015 ) but bought wisely no reason they should cost mega money to keep on top of .
Replacement brakes all round would be £1k ish so worth particular attention to condition , oil service & brake fluid i had done before selling , that was £170 at a Bmw indy .
Heads up display , Harmon Kardon sound & carbon roof are pretty much a must to have , otherwise can prove difficult to find a buyer when the time comes . ( carbon roof is standard but sunroofs were a option , with sunroof you lose the carbon )
Tyres are subjective but are always going to be pricey with the size of them , for the 3rd time i was unfortunate to buy a car with a virtually fresh set of PS4S fitted
they really are one of noisiest tyres i have ever come across . mine was on the 20 inch 666M comp wheels so you would expect some noise but i fitted a set of winter rubber on 19s for a short time & the difference was like driving with the windows up V windows down.So what to buy after a M4 ? in the past 10 years my weekend cars have gone from £7k Si roadies , £9k Si coupes , £12k - £13k ZMRs , £14k 35i E89 , £15k TTRS & £20k 997 Carrera4 : the M4 i paid £25k for .
Do you get more pleasure the more you spend ? in my case absolutely not so rather than tick another box of cars id like to own ( 981 Cayman ) i've done a complete about turn & gone back down the ladder
recently purchased a 15 plate mk7 Golf Gti manual 
lets see how many weekend miles i manage in 12 months .
we both love it , full of spec , rare , comfortable & build quality is supreme , bettering a F series was never going to be easy but after looking at various Mercedes E class , CLS , Audi A6 A7 Bmw are way ahead right now in my opinion .