As for the quality in photos, I haven't seen any deterioration using it, although over time it has gotten its share of scratches.
As for protection, yes, it does protect my phone's cameras, but when I don't use cases that protrude enough to protect this little glass too, I can't say I'm satisfied; with the slightest drop it breaks!
Fortunately, I often find them on other sites of well-known chains on offer for around €6, because otherwise I would regret my money.
The 2 times they broke for me, the drop wasn't even 20 centimeters!