Not sure about the H3X at all. I have had my H3 for about a month now. I love it! Visibility is bad out of the back but my parents Volvo XC90 is bad as well. This is common throughout SUV's. That being said I back down my driveway every morning and my driveway is steep and curvy. You get used to it.
As far as power goes I think it has plenty. I've owned some pretty fast vehicles and am not at all bothered by its lack of HP. It isn't a sports car by any means but speed wasn't what it was designed for. This so called problem is way overblown. Just my opinion. 
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H3 Black Lux, ebony leather, sunroof, monsoon, XM, 6 disc changer, DVD players in headrest, trailering equipment, chrome appearance
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