when I'm Working on an adjustment or a layer-filter, I like to compare the actual adjustment I made with the status before without this adjustment(-layer),layer-filter.
I don't want to switch from the Adjustment-/Filter-setting-dialog-window to the adjustment-layer for toggling the layer on and off.
I think it's smarter just to click on a "BYPASS"-button to compare.
best regards and thanx a lot for the tutorials, you're doing a great job :-)) yancire