Just completed installing the "improved" CDV I ordered from Zeckhouse. The biggest challenge I had was jacking the car up. Since there are only two jack points, I had no idea where to put stands, so I lowered the car on ramps. Left very little room for me underneath the car to work. But using a vacuum based one man bleeding system, the whole install was quick and easy.
My feelings on the difference. I should have done this right away, shifting is much smoother.
As far as brake fluid, I paid the premium price for the BMW logo on my bottle of Dot 4.
2007 335i Coupe