Jason,
It is soo much lighter steering when you maneuver at low speed. It is getting progressively stiffer with speed. After I upgraded my tires and wheels from 235/65-17 to 255/50-18 it was really noticeable increase in effort to maneuver or park. The Servotronic resolved this issue. Back in 2013 I paid close to $300 for the A1 Cardone rebuilt rack and $150 for the valve. Please note that Servotronic rack is not the same as a standard one – it has an opening to install Servotronic valve. The two prong plug on the left strut tower is the one for Servotronic valve. Part # for the valve 32106788212. I see one on Partsgeek for $155.

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2012 X5 x35i My new toy
2005 X5 4.4 Her's (Retrofitted Servotronic Steering Rack)
2003 X5 3.0 Mine (Retrofitted Servotronic Steering Rack and Heated Steering Wheel)
2001 M5 Son's car
2000 540i 6sp Sports pkg, supercharged. Son's car (Sold)
2001 530i (Sold)
1999 528i (Sold)
1975 2002 (Sold)