I just finished putting together this attachment, so I do not know about longevity, but it was easy to put together and it is SO NICE to adjust the sit, stand feature without pressing any buttons, etc. You just lift into whichever of like 5 heights you prefer, then pull out to unlock it and slide it back down. I hadn't noticed in the pictures, but it really does sit with a significant gap between the adjustable height piece and the rest of the desk. Heads-up, the latching mechanism that engages when you raise and lower the adjustable height piece is pretty loud when it clicks through the stages. It is quiet once it is latched, though.