I had the Aluminium trim in my X3 - hated it with a vengance to be honest.

The X3 trim was real metal over the plastic base- but it scratched very easily and looked poor quite quickly - I swapped it out for the plastic Titanium II trim which seems to keep its looks better and is not so 'bling'.

Each to his own I suppose & I think the newer Alu trim is slightly different - mine had the sort of 'spots' which look like a big version of the E46 cube trim - too much IMHO!