I have only driven my Z4, my old 328 and my sons E92 M3 and our E70 X5 3.0 feels like a freaking tank compared to them. Seriously it feels like it weighs 8000lbs and this is coming from someone who drives a 2014 Mustang GT. :-)

In the X5 you give it a little gas and it goes a little, almost like the power is going through a silly straw, give it a little more gas and it goes a little faster, give it full throttle and the 3.0 wakes up and start singing and she moves along pretty good for what she is. For an SUV it feels "OK" in the twisties but nothing special, braking seems OK, the brakes have way more power than the tires have grip anyway. This car might be fun with the m package wheels and tires and 550hp. ;-)

Our X5 does seem quiet but the M3 and the GT Mustang have exhaust. But for the most part it does seem to have the luxury car ride and quietness. Ride is a little harsh on runflats but I will fix that once they wear out. My sons X5 seems like a night and day difference from our E70. I wouldn't mine picking up a newer one for sure.

Attached Images