Bought used w/20,000 and am now up to 170,000 - no major problems. Replaced the ball joints was the biggest cost item. The Explorer has always started and is great in the snow, 4WD is superb and easy to operate. Had a Jeep Cherokee, which also was great in 4WD, but the Explorer is much more comfortable and roomy. Visibility is also very good. Worth a lot more than it's valued at, not sure why it gets any low ratings (because It's American I think).
Great room, comfortable. 4WD is great.
Bouncy ride, center storage bin is awkward, improve the ball joint design.