Anyone can share their experience with dual slot CF -> IDE adapter?

Any idea if the two CF cards will take up both master & slave of the IDE channel?

I want the fastest read/write speed as possible, will having two CF card share the same adapter causes any performance hit?

How is the speed of 2.5" hard disk compare to microdrive?

I plan to have a CF and a Microdrive in the adapter, the microdrive will be used for data that need to modify often.