I've used this with 21" and 23" monitors. The small monitor is fairly light, with the large monitor weighing around 12 pounds, which is well within the stand's advertised limits. After installation I had to increase tension on one arm to hold the large monitor. The first 2 days everything was great. On the third day I went to my office and saw the monitor on the table. The hand is out of order. It was easy to put together and seemed solid until it broke. Cable management isn't the best. It takes up more space than my other monitor stand. On a positive note I had no problems getting my money back.