Okay, so I finally got this little plastic guardian for my thermostat after my nephew kept turning our AC into a winter wonderland setting. First impression? It's like putting your thermostat in a tiny bulletproof vest!

The installation was stupid easy – just two screws and boom, done. No fancy tools needed, though I did accidentally stab myself with the screwdriver (totally my fault). The clear plastic is thick enough to feel protective but doesn't make the display look weird.

Major win: Comes with TWO keys! I immediately lost one (classic me), but the other lives on my keyring now. The lock actually works – tested it by challenging my husband to change the temperature. He failed miserably (victory!).

Only gripe? The edges are sharper than I expected. Not knife-sharp, but definitely 'don't run your finger along it' sharp. Also wish it came in colors – clear is fine, but how cool would a smoked black version be?

After three months: No yellowing despite being in sunlight all day, and zero tampering success from visiting kids/pets/annoying relatives. Worth every penny for the peace of mind alone!