I have about 25k miles on 255/55R19 111V Michelin Premier LTX and they are fantastic and still look new; a good alignment helps with that. Quiet, smooth, good fuel mileage, quite good in snow/ice even when compared to my Michelin*Latitude*X-Ice*Xi2. Taken them cross country and back and quite a few trips up and down the East Coast. They are not run-flat.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim