After unboxing & wiping all the oil off (which is a necessity for product being shipped from overseas to prevent corrosion, kudos to Vevor), installing the blade and checking all the fasteners for tightness, I set the angle to 90° for the first cut. To be honest, I was very surprised at how accurately it cut. It is as close to 90° both horizontally and vertically as I can measure. Removing the saw from the base is simple and cutting in this mode is easy.
Some reviews complain of where the cord comes out of the handle, but it is necessary to be there when the saw is removed from the base. To keep the cord out of the way when mounted to the base, just pass it through the handle.
I am very happy with this saw, and it doesn't take up much room in the shop!