I'm not sure I like that design all that much. It looks pretty heavy and bulky for an item that generally sees very little use. ...
I agree there are better designs.
The standard small Russian steel signal mirror (a bit) bulkier and nearly twice as heavy as a 2"x3" glass mirror.
I've used the standard 2"x3" Russian double-sided steel signal mirror with the hinged plastic screen that is standard in Russian survival kits, and it certainly isn't my first choice in that size category. The stereotype is that the Russians place an emphasis on high robustness, and this mirror scores well there - the steel plate is 0.06" thick.
I concur with the USAF choice - a 2"x3" glass mirror with a retroreflective mesh aimer, like the MIL-M-18371E the USAF issues to their pilots, or the commercial equivalent (Coghlan's 9902).
The advantages of the 2"x3" glass over the 2"x3" steel are
- The retroreflective aiming method is much easier to use than the double-sided mirror method.
- Stronger flash signal because glass mirrors are more reflective than metal.
- Better scratch resistance.
- Lighter than the Russian mirror (54% as heavy[1]
The nice thing about the Russian mirror vs. other 2"x3" double-sided steel signal mirrors is the hinged flap which lets you use the double-sided mirror technique one-handed at all angles, provides scratch protection for the rear surface, and holds instructions. These mirrors are issued in sealed transparent plastic bags for further scratch protection - I have 3"x5" examples from lifeboat kits for oceangoing vessels (in the 3"x5" size).
[1] Weights of three 2"x3" class mirrors in protective packaging:
- Russian hinged steel mirror: 28/8 oz (3.5 oz) in sealed plastic pouch.
- Coghlan's 9902 2"x3" glass mirror: 15/8 oz (1 7/8 oz) in foam case.
- SOL Rescue Flash polycarbonate mirror: 7/8 oz in retail blister pack after excess cardboard cut down to reduce bulk.