One thing he didn't talk about is clock drives. They're essential for photography, but they're also good for keeping the scope on target if you want to let other people look through the scope. Especially at higher magnifications, the thing you're looking at will move out of the field of view in a few seconds without a clock drive. The one disadvantage of Dobsonians is you can't put a clock drive on them (well you can, but it requires two motors instead of one. And high magnification is not really the point of a dobbie anyway).