In reply to John:
Have you looked through a good scope? The quality is just not comparable. Also, you get the image directly on your eye, rather than on a puny screen or even viewfinder that gets drowned out by sunlight.
Conversely, digiscoping even though a good scope will never give you the same image quality as with a nice full format camera behind some serious amount of glass.
Scopes are also much lighter, so if your priority is watching rather than photographing they are much better suited. The reason is that they are manual focus only, and that the zoom unit is typically integrated into the ocular module, not the objective part of the scope, so much less glass needs to be adjusted.
The Swarovski ATX is actually a compromise in that respect, as you can exchange the entire ocular unit with a camera bayonet (focus is still manual, though).
Horses for courses, I guess.
CB