I have used the Girraffe light and magnifying glass for about 10 years now. I bought it when my old light with magnifying glass and articulated & spring arms gave up the ghost. It was well spent money and one of the best fly tying purchases I have ever made.
The glass and the arm pivot on the mounting base so it is easy to swing out of the way when necessary and the flexible arm does not have to be readjusted when returning it to position. Quick and easy!
The only draw back is that the glass is actually plastic and will therefore scratch if you wear your scissors as you tie and are careless. Replacement glass (plastic) lens are readily obtained at a reasonable cost directly from Giraffe if necessary.
You won't be disappointed.