We went from a Series I Discovery to the Series II, to a '03 Expedition, back to an '03 Discovery. The 18 or so months with the Expedition were great. IMO it (fully loaded with EB package, 4x4, DVD, captains seats) way out classed the Chevy/GMC alternatives. It was dead reliable, got reasonable MPG for it's size, was very comfortable and did everything we asked of it without a wimper. It sported the large triton 5.4 V8 and it simply cruised on the open road at 80 mph without any problem. We sold it to go back to the Discovery...even though the Ford did just about everything better and with way less drama...the wife said it had no soul...
YMMV.