...with Penquin and JCL.
And, though the X has been out and about as a model since late 2000,
the reports of people turning 200K+ miles can be noted on one's thumbs.
My guess is E53s will start reporting that mileage later this year or next,
but the complexity does increase from E53 to E70, and with each successive MY.
Meanwhile, if you like/want an E70, get it & enjoy it knowing you have
4 years worth of net, and another 2 years after that, if you reload the
warranty.
GL,mD