As Ian stated 'It\'s main disadvantage is the helical focus ring'.... Nah, I don't buy that so it goes to show you how different each of us are on our thinking and our needs. To me, the helical design makes it real easy to achieve focus and by using a timer on my camera, the scope is solid, no wobble...
The helical design to 'me'...is so much easier to use than one where I have dual knobs to worry about. The large helical design allows me to focus with gloves on in the middle of winter...something I find almost impossible with the small dual knobs.
Again, my personal opinion but this scope is tops among all....