Diopter adjustment knobs and focus adjuster are to big and to easily turned. When you pick this unit up or if someone hands it to you, you can't help grabbing some of the knobs and turning them out of focus, which you will then have to readjust each time.
Other than that, their great.
Pros: Image
Cons: Not built for being hand held
This review was written in the old system and had content requirements that are different than reviews written today.