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For the price, I expected a little more. This unit has no bearings or rollers, just a couple of plastic "cars" inside a track. The product listing ad copy says, "Pulling the tray out from the middle produces the smoothest transition". That must be because it is clunky and does not slide well. Adding a little graphite lube did nothing to improve the movement. It's "Ergonomics" are dependent upon where and what you install it on. It hangs too low on my standard height table. It is easy to assemble, but that is it's only redeeming feature. Save your money. This one is going back