wranglers are not to be bought for comfort, so if that's what you're looking for, forget about it. Cherokee's are great, but its definitely no Denali, however, the 4.0 IS indestructible. When they get old enough, the car rots around the engine... Mine just turned 229,000 this week, and NO major problems at all, just had to replace floor boards
Grand cherokees are much more comfortable, but since i've never owned one, i can't say how reliable they are.