Always liked the i8 and very undervalued, underated car. Ahead of its time and for the money great cars.
Ironically the Z4M is a very similar type of car from a different era. Super underated and undervalued.
Your never going to get a positive response from an M thread from a niche following of a niche sports car like the Z4M. With a target audience from a generation that isn't pro to change.
For daily uses, ive left ICE behind. Fed up getting bent over in every direction as a motorist from a cost perspective in the UK. Its a topic that doesn't belong here.
That being said, very hard to compare and as a package, the Z4M is incredibly difficult to beat for the cost. £25k for an i8 is a bottom-of-the-barrel, early, high milage example and isnt really comparable. Cheapest one is a questionably wrapped 80k early car for 28k. Asking for trouble with them as they do have costly issues that I wouldnt want to entertain at that price.
35k will get you a later nice example which makes it quite a lot more money and not comparable.