opinions on legshield mirror

I use an open face helmet which makes for good visibility all round but I have been thinking about adding a rear view mirror for some time. I've had some close calls looking behind me at times
The problem is I cannot fit a headset mirror because my expensive scooter cover isn't large enough .
I am therefore considering fitting a low legshield mirror.
What are the pros and cons of the two options ? what do you use and what is your experience of using them.
The problem is I cannot fit a headset mirror because my expensive scooter cover isn't large enough .

I am therefore considering fitting a low legshield mirror.
What are the pros and cons of the two options ? what do you use and what is your experience of using them.