John
The main point in using a DSLR with a scope is that you can use the electronic viewfinder, to guage the sharpness of your picture when manually focusing the scope, i use a Pentax K10D DSLR attached to my scope. ( which doesnt have liveview)if you use the screen you are still back in the days of using your sight from a distance to sharpen up the picture from the screen, some people can, some cant
to me its much easier just to use the electronic viewfinder, but only if you have tuned in the diopter on the viewfinder, something many people dont even think about when setting up their DSLR to a scope
I spoke to Clay Taylor from Swarovski USA who i consider to be one of the foremost DSLR digiscoper's the other night on skype, and this subject came up, we both agreed that its another way of focusing BUT, we would fall back to using the viewfinder, quality of glass and image is our main reasoning. Clay firmly believes that DSLR digiscoping is the way forward, with so very few suitable P & S cameras now coming onto the market
He is at the PMA show in Las Vegas where all the new cameras are shown, and he said he will try to get round most of the stands time permitting, to test out the newbie P & S and this will involve some of the DSLR's hopefully
Paul