True true. But the H2 has the width that helps it prevent rolling, not to mention it weighs like 6,700 lbs. So I think it would be a lot harder to budge than the X was. And I'm pretty sure the H2 has a pretty solid roof, I've only ever seen one that ended up on it's roof, it rolled off of Lion's Back right at the starting point, I think it was somewhere around 15 feet to fall, and the roof was obviously dented and would need new roof racks, but it held its shape fairly well and protected all of its passengers.
And as far as choosing the H2 over the others, I've already had an Xterra, and I like variety, and I can't stand the look of the new Tahoe and Escalade, the new '07s are leaning way too far towards the bling side than the ruggedness of the '06- Tahoe Z71. I much prefer the looks and capabilities of the H2. Not to mention you can't beat heated leather seats front and back, TV screens with separate DVD players in the headrests, navigation system, Bose Premium stereo system, and owning one of only 400 Glacier Blue H2s that will ever be made.
As far as being careful off-road, so far the one and only complaint I've heard about the H2 is that the tie-rods are prone to problems, but other than that everything else seems to hold up quite nicely. But I guess only time will tell.