When I ordered my 530e I wanted full Merino leather (Caramel Black was my choice) BUT I couldn't wait the additional months so I ordered the regular Nappa. I think the Nappa is essentially equivalent to the Merino but I do wish I had the full leather (I did get the leather dash as well).
I agree with you that the full leather really finishes the cabin. If I had the time I would have ordered it. If you can afford the time and money...I would definitely go for it.
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