Greetings Keith,
I had a WA6SE with the DACT attenuator.
The difference between this type of device and a typical volume potentiometer is that there is only one set of resistors in the signal path at any given time. A standard volume control will add more resistance to the circuit the more it is attenuated, that is at the lower end of its range it may not sound as good as when it is "wide open" or at is upper level. The difference is certainly not night and day, however, with a headphone rig every nuance is magnified so I find it to be quite relevant in this application.
If you are already planning 1.) Sophia or EML rectifier and 2.) Premium Parts Upgrade then I would say just do it and be done but I certainly would not make it your main priority.
I have a WA5 now and was told that this option was not available due to the circuit design so I have the standard Alps control; had it been offered then I would have certainly added it on.
I do find on occasion that I miss the precision of the DACT control, some of the WA5LE owners are putting in the Alps RK50 pot which is not a stepped attenuator but a mega potentiometer and indeed a work of art. But at $700 you are really hitting the point of diminishing returns but I guess it is all relative.
In any event you will really enjoy the WA6SE, I think it is one of the best amps in the Woo line for price/performance and the build quality is really something to behold.
Enjoy!
