They are great engines but are nothing on the V8 in terms of noise and throttle.
I found the s35i a little rev shy. And a lot of complaints about the M4 due to low down traction. However they are no doubt quicker but a little dull compared to wringing out the V8
Last three tanks have done just over 250miles. The fuel economy still annoys me though as it's eye watering if you drive it hard. In contrast the s2000 gave similar (arguably more of an ) experience but with half the fuel consumption.
I'm loving the car but it is missing something. I am hoping an exhaust solves that. It's so quiet inside, however on the flip side the ride comfort and auto mode is what I am really enjoying when I'm chilled out mode. Thing is even when taking it easy it won't get more than 25mpg.
I've done 2500 miles in it as a daily driver so I guess it's not the typical use !
Consider getting the '2 pipe mod' - basically a welder can take out the muffling in two of the 4 pipes, creates much more of a noise. I did this on my M3 and loved it - bit loud on cold start though. 4 pipe mod is insanely loud. You should be able to get this done for about £150-£200.