Ultra reliable, good mileage (steady at 21.4 on road trips), snappy acceleration... Best truck I've owned until I bought a 2000 Tundra SR5, then a 2006 4-door Limited Edition Tundra.
The T-100 is still an awesome workhorse truck that never falters. I have changed only the oil, oil and air filters, battery, and tires.
My neighbors with F-150s and silverado 1500s don't even come close to the either the T-100 or the Tundras.
Good power train.
Comfortable on multi-hundred mile long trips.
Keep up the good quality... have seen none other as good.