I tried it for the first time in my car. From what I understand, it is a much better fluid and will not absorb water so the brake system shouldn't end up with rusted cylinders and cruddy looking brown fluid.
Just open the bleeders and pump the fluid out of the MC. Then fill with DOT5 and bleed it through until it comes out clean at all 4 wheels. The stuff I used was purple so it is easy to tell when it is there.
You will need to almost empty the MC to keep the old fluid from mixing with the new in the MC. The stuff is too expensive to waste by mixing some and then having to bleed the mixed stull out. Unfortunately, that may introduce air in the system unless you are really careful. In any event, fully bleeding the system will remove any air introduced.
Only time will tell for sure, but it seems good so far and I want to put it into my daily driver.