I brought this product to elevate a client's bed. However, don't use it on rugs, the stability is not there. Better on flat floor. I gave the rating above, not because the product is bad, it's actually really good when used with the right frame. I love the USB. Great idea. The rating is more because you can't use this if your frame has wheels. Even if you remove them, as I did, the diameter is too narrow and as a result they will tip over, as I experienced!Phone chargers slow... sometimes only one will work at a time. My big & big booty friend crushed one or two within 2mo.I used these for my cutting table in my sewing nook. I love the outlet for when I’m ironing. The height increase has made such a positive impact on my back pain that I was experiencing after cutting and piecing. Very happy with this product. Highly recommend.I needed to raise my bed to make some extra space in my room. These seem to be working very well so far. I really enjoy the outlet feature as well, it makes it very convenient for charging my laptop and phone on my bed. My bed has 9 posts so I have 9 in total distributing the weight. I would be concerned with using these on narrow posts as I feel like they could break through the center, especially if there are fewer posts on your bed.Great product. Its just as described in the description.These were easy to install. Very sturdy. Had one issue with stabilty.Fell into the bed one night and half the bed fell...cracking one of the lifts right down the side. Still working.Iedit. I spoke with customer service and they sent me two replacement parts. great customer serviceI bought 2 sets because I needed 7 risers for my king size bed. 2 of the risers broke. does not hold up a bed.I really wanted these to work especially since they have an outlet in one of the four but it did not.