250kg added to the kerb weight with economy nowhere near as good as the diesel version? Doesn't make much sense.
Ok, so the X6 hybrid is a lot faster than the diesel and it allows lovers of V8 engines to drive this car with a bit less guilt, but if you like the X6, the diesel makes a lot more sense and if you must have a V8, go for the normal version which weights a lot less.
Now if BMW could make this hybrid system weight a lot less, that might be a different matter.