IMO, If you could "feel" it kicking in, it would be too slow to work - think about it.

I just bought a 2011 Sport Package Xdrive50i Adaptive drive and have driven her about 600 miles so far. I am a very critical driver - I notice every little thing about my cars. I have thus far only experienced pure amazement that this vehicle is so fun to drive!

The X5 replaces a 2007 Acura MDX. I used to think the MDX handled pretty well compared to other SUVs, however the X5 is leagues beyond the MDX in the handling department. The X5 is so good, that it has crossed over into a realm of cars that I love instead of cars that simply serve a function.

Don't think twice about getting AD - I haven't heard one negative comment about it coming from those who bought cars with AD.