If I understand my memory cards - the class 6 SDHC promises a minimum data transfer of 6mb/s. Class 4 - 4mb/s.

The CF cards - assuming solid state - can get to higher than that. Of course it would depend on brand and specifications of the individual unit.

I consider the adapter useful only in the case that you either don't have a CF card and have multitudes of SD cards.....or your 1st SD card is too integral to your unit's operation that you cannot switch out SD cards.

Is that the case?