I remember the first time I drove a 4.6is - it was the first time I drove any X5 for that matter. Forget exactly what year that was - must have been 2005-ish and it was in the showroom and aprox 2 years old. I fell in love with it - both the looks and how it drove. I do remember the car was way more money than I wanted to spend, and I went on to other vehicles for awhile but always held a fondness in my heart for these amazing beasts. I recall it was dark blue with black interior.
Fast forward to last year when I decided I wanted an SUV that would also double as my business car and the X5 was the one that made the most sense to me at the time. I actually owned a 540iT before, but this 4.6is is a nicer vehicle in just about every way and more fun to drive too. There is just no comparing it in vehicles that can do SUV things and also are great to drive on the highway and still a blast to fling around a corner or freeway on-ramp like you would an M5...
Sure - a pathfinder or 4runner would fulfill the same purpose and no doubt be a lot more reliable, but it just would not create the kind of passion that I like to have for my cars. This X5 is a good fit for me.