The RKS30X is in my opinion the best keyboard stand on the market. I will explain why. First off this uses a push button mechanism to adjust the height up and down. With the RKS30X You will not have to sit there turning a knob like with conventional X stands. With this one, you hit a button and you can adjust the height of the stand quickly and easily. This mechanism is actually also way more sturdy than the older technology. Most X stands have square shaped tubes. The Rockville RKS30X has circular tubes. Our engineers found that circular tubes are more sturdy and are stronger and more durable. These can withstand a ton of impact. The weight capacity of this model is 132 pounds. This is a conservative rating. I weigh 160 pounds (pure muscle of course) and I was able to lean all my body weight onto this unit with my feet totally in the air and this unit supported me easily. We rate this at 132 pounds capacity although it can really handle more than this.