Roady, Richard W's comments above are pretty much spot on, his 3.7 was built just a couple of months after mine
Mine is now just over a year old & in comparison to my previous S1 Roadster (which I did 50k miles in) they are quite different & yes you have to adapt to the rev-hang, if you 'cruise' and change up below 3500rpm it's almost un-noticeable
Having spent 10 years gradually fine tuning the S1, inc suspension upgrades, the first few weeks with the 3.7 were a bit of a love/hate learning curve & I eventually fitted SSL to the front, as for me I felt the std front was fighting the new 5link rear
As for longevity, I have a friend who has an early (2012) 3.7 with well over 30k miles he has put on since owning from new & he's had no mech / elect issues at all
