I test drove the Tahoe, Expedition, Sequoia, and of course the Armada. The Armada beat them all. The Tahoe and Expedition had decent power, but both felt like a big truck. The Sequoia felt like a luxury car, but lacked power and lacked all the "extras" that come with SUVs these days (i.e., fold flat seats). The Armada felt like a powerful sports car that, oh by the way, could also haul 8 people with extreme comfort. I am satisfied with my choice.
Great stereo, lots of power, and very comfortable. Second row seats have more leg room than anything I have ever driven. This will be great for family trips.
Power driver-seat buttons are too high (I bump them when getting in and out which moves the seat slightly).
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