Let me start by saying these locks are a game-changer for anyone with sliding doors (and curious kids or pets!). I installed them on my patio door, and the peace of mind is priceless.

The installation was straightforward, but heed the warning: measure your door frame first! My frame was just over 2 inches, so it worked perfectly. The included screws are sturdy, but as some reviewers noted, they might be too long for thinner frames - keep a shorter set handy just in case.

I love the dual-position feature. The two notches allow me to either lock the door completely or leave it slightly ajar for ventilation while still being secure. This is perfect for those days when I want fresh air but don't want my toddler wandering outside unsupervised.

The build quality surprised me - these feel much sturdier than their price suggests. The spring mechanism has a satisfying click when engaged, and after months of daily use, there's no sign of wear.

One clever feature I discovered: when installed on the top rail (as I did), it actually helps prevent the door from being lifted out of its track - an extra security bonus I hadn't even considered!

The only minor drawback? The white finish doesn't perfectly match my off-white door frame, but that's nitpicking. For under $20 for two locks, this is one of those rare products that delivers way beyond its price point.

Final verdict: If you have sliding doors and value security (or have little escape artists at home), these are absolutely worth installing. Just remember to measure first and maybe grab some shorter screws before you start!