I agree, getting a second opinion should almost be considered a necessary tool...
About software and digital hardware, mathematically there should not be any
difference, however, a hardware unit is dedicated to one task whereas the pc is
often running loads of stuff.
When talking about reverb for instance, when a pc is pushed hard in processing,
small alterations in the pitch of the reverbed signal might occur.
It is of course inaudible to the ear, but can be audible as loss of transparency
in a mix.... Using external, hardware units minimalizes the potential for this....
I definitely hear the difference between a hardware unit such as the 96K and
high quality plugins such as the Powercore plugs, which I also have.
After I got the 96K I haven't used the Powercore once, its simply stunningly
good, often it's enough to find the right preset, no need for tweaking, it
sounds just like on a cd bought in the store...