[TenTec] Orion 565 vs Orion 566?

[Eric Rosenberg <ericrosenberg.dc@gmail.com>]

There's a possibility that I may be able to upgrade from an (original) 
Orion (with all the INRAD filters) to an Orion II.
Is there really that much of a difference between the two that would 
make it worthwhile?  It's my understanding the sub-RX is the same (i.e., 
no individual filters, no good for diversity reception), that the 
display is in color (no big deal) and the scan function is better, all 
as a result of a more powerful processor.
Is there something I've missed?

Thanks,

Eric W3DQ
Washington, DC