I don't own any Apogee gear, so I'm not familiar with it…
In my experience, it's alright to have two digital devices with one clock slaved to the other. Once you use three or more digital devices, I think you should use one clock and distribute the one clock signal to all your devices that connect digitally…
As a side note, I just upgraded to Leopard and have been making sure that my software works on it. After I'm happy with that, I'll change to Snow Leopard…
