Contrary to what you may have read on other websites, this visor does have provision for mounting two lenses at once, allowing them to be used in combination. Both mounts are pivoted, allowing the lens to be folded up for a greater view area without needing to raise the visor.
While the plastic used in the construction looks brittle, in practice it seems robust enough. The main thing to watch out for seems to be not pressing the lamp against something when inserting the lenses. The flexible mounting of the lamp does help prevent damage, and if you use a surface such as your lap you should have no problems.
Not tried the lamp out yet, but the example I brought thoughtfully included a pair of AAA batteries ready for use.
I'm a miniature painter and have finally had to accept that painting fine details such as the eyes is becoming more luck than skill. Another benefit is that I can now get a real time view of the model much closer to what the camera sees. We have all painted models that we thing are flawless only to photograph them and have flaws appear on the photo. Using the magnifier I should be able to get the paintjob right first go.