I admit the door I am trying to keep open is unusually high off the floor. I ended up stacking all three doorstops, using zip ties to hold them together, to get enough height to be useful. Even then, the doorstop slides away too easily and the door swings shut. The doorstop is on a laminate floor and it just doesn't grip. I am disappointed in this product.Great door stop. I use a single one for one door and double up on another for a door that’s a bit higher off the floor. Seller provided a thingy that allowed me to combine 2 stoppers easily. I also love the adhesive storage thingy that I put near the bottom of the door to place the stopper when it’s not in use - great idea.I ordered these door stops strictly because they came with a clip to hang them when they're not in use. I am the type of person who likes my "things" to have a specific place to go when not in use. I attached the holder to the bottom of the back of the door they are being used on. I appreciate the ease of moving them to their hook when they're not in use so they're not being kicked around or lost elsewhere. The size works great on our doors and it's fabulous that they come with a clip so you can double the size if your doors have a higher gap from the floor. Truly useful!I have a couple of interior doors in the house that don’t stay open all the way when I want them to. These door stoppers slide easy under the door frame and are unobtrusive, which I like.I had some very old door stoppers that didn’t work. The weight of the door would slide things shut, I hadn’t bought any door stoppers in years. These stay in place and my husband thing to me for buying them. Best of all they come with a wall holder which I didn’t even realize so when you’re not using the stopper you can pop it into the holder. Brilliant!Great product, study. Excellent door stoppers. My son is using them in his college dorm. Really like that they are orange and had a holder to help them not get lost too easily.Just what we needed to prop open internal doors that tended to slam shut when the air conditioning turned on (or we have a resident ghost) but either way, it worked great. No slipping when using on carpet or tile. We did not use the doorstop holder.It feels weird to write a review for a doorstop, but seriously, just buy it.My classroom door is heavy - I mean HEAVY - and my youngest kids can't open it. Of course, we also have slippery tile floors. This doorstop is the bomb. No slipping. No sliding under the door. AND the fact that I can just pop it onto the storage slot at the end of the day means it doesn't get pushed into corners by the sweepers at night. I thought the holder was silly until I realized I never had to look for my doorstop in the mornings now!Very good make and good price . I have a fire door and they keep that door open without any problems.Does the jobVery versatile and useful product. I have tried other doorstoppers that proved useless. These are cool!Tried on 3 different surfaces. Didn’t workThe rubber does not grip on carpet, tile or linoleum. Wedge it under the door and it slides on all these flooring surfaces. As far as using for security- the device can be pushed from the outside of the door as it sticks out on the outside. Very disappointed with this product.