The red dot finder is common among beginner scopes. It is a humble device that merely projects a red dot on a screen. It is easy to align and sturdy. It is much better than any plastic scope type finder.
The diagonal that comes with the StarPro 70AZ is not very pleasing. Although it is perfect for terrestrial observations, it slightly lowers image quality with astronomical objects. It creates a faint line across the image and tiny spikes around the stars. But this is an acceptable sacrifice to keep the cost down since a star-diagonal is really expensive.
The focuser is sturdy and smooth enough for a 70mm refractor. It is not metal, but this didn’t surprise me considering the price. I am OK with a plastic focuser as long as it doesn’t affect the observation experience, and that is the case with StarPro 70AZ.
There is also a smartphone adapter that comes with the package. There is not much to say about it as you might guess. It does its job. It is a sweet entrance to the astrophotography world.