The only time I took my X real fast was on a straight two-lane (one each direction) backroad where there were few cars. However, just cuz it was straight doesnt mean it was flat. At over 105mph (I went up to 115) the X3 was overall well-planted, but any significant change in elevation or bump in the road would shake driver confidence due to the suspension that doesn't really soak up the bumps as much as it should. It didnt feel too light (not at my speed), but the minor bumps would shake some of that typical BMW driver confidence.

Same thing occurs on mountain interstates when you're going down a grade at 80+mph and there's a pavement change or significant bump......really gotta grab onto that steering wheel.