Just installed these bad boys yesterday and already feeling 10x safer in my apartment! The adjustability is insane - went from my narrow bathroom window to the wide sliding door with zero fuss.
The rubber ends are GENIUS. They grip like crazy but don't leave marks. I may have accidentally tested their strength by leaning my full weight against them (oops) and they didn't budge an inch.
Pro tip: That threaded adjustment thingy? Total game-changer. You can make it tight enough that even Hulk would struggle to move it. My windows can breathe now without me worrying about break-ins.
Only complaint? Wish they came in more colors. The white's nice but a matte black option would've been slick. Still, for the price? Absolute steal. My peace of mind hasn't been this cheap since... ever.