I've no interest in something like a 750i really. For me the appeal of a car like this is that you actively *want* to get into it and drive huge distances and part of that is being able to do so with a significant tank range and a fuel bill that doesn't make you really need to crack out the man maths calculator to justify not giving Easyjet your money.
I didn't want a 530d but now I've got one I've become rather fond it's breadth of ability. It's almost as quick as my 335i was really and yet I was able to drive to Germany and back on about 80 quid worth of fuel
The only thing that still bugs me about it is the lack of refinement when cold. I wish it was a later start/stop example as thats when you really notice its a diesel. The rest of the time it's genuinely smooth, refined, quick and whilst it doesn't sound 'AMAZING' it actually does't sound that bad either.
Is there some Purchase Justification Syndrome in there? Probably. But I actually really like this engine now.
It's the only diesel engine I'd have though - A few months ago I put 500 miles on a 420d and the engine is just awful.