Shocking does not even describe how well these work. We have a huge armoire of solid wood which must weigh close to 750 pounds. It was so heavy that the only way I could even budge it on the carpet was to sit down, back against the wall, and push with my legs. This would move it an inch or two. So, we needed to move it into another room entirely. The choices were total disasembly (which we did before and took a few hours of painstaking work), or try something new. We tried these.
They work. Not kinda. But totally. It took all my strength to lift each leg up a few inches to slide these under. And then....I just pushed the beast and it slid along. Not effortless, but like it was 80 lbs, not 800 lbs. Truly. I still cannot believe it.
And, they did not break after I used them. And hell yes I am going to use them again, and like, forever.