That isn´t quite true, is it?
The Powerflyer is much faster than the standard IDE-controller on any Amiga. And, the Powerflyer also comes with AllegroCDFS which supports "non standard" IDE-devices, such as LS-120 and DVD. But, it´s cheaper to get one of those IDE->SCSI converters (yes, they do exist and are working good) if you don´t need DVD for example... =)