I enjoy the flex frames, because kids are not always careful when they play. Having these Auto Flex glasses knocked off my face when rough-housing with kids in the playroom does not mean they will be bent beyond repair. The flexible nature of the construction makes them come right back to form.
By far the most durable frames I have owned in 50+ years of owning glasses. Just like military aviator frames, but better. Give a great field of view. IMHO - never go out of style (but are never the current fad)