I was very impressed by this adjustable standing desk by (Inbox Zero) the construction was heavy-duty in my opinion yet easily maneuverable. The vertically adjustability is fairly easy to use and that was an important factor for me being I have weakness in my hands and wrists from Rheumatoid Arthritis. This model has right side and left side handles both must be squeezed when selecting to lower desk to lowest setting, while the left side alone has a slow incremental upward adjustable  releasing mechanism not unlike a computer task chair. In addition it has a right side lock that can be snapped into place in a flat position for safety when moving it to another location making it really convenient and it has four nonskid pads on the bottom legs to keep it firmly in place while in use. Overall Im very pleased with this product.