We also control the Optimus mega changers from Radio Shack. Prices may vary. The Pioneer Mega-Changers are available from some mail order firms. Both models have the TosLink Optical Digital Output.
Access time is much quicker.
All other specs are relatively same, including the overall dimensions. Each rack holds 25-discs, and you can change CD's in three of them without interrupting playback of CD's in the fourth. The PD-Fxxx gives you instant access to any disc and track. It even lets you divide your discs into three categories for customer playback. You can group them by type of music, artist, or by family members' personal favorites.