In this review we'll go into greater detail on the TR5000 model - the most ruggedly built and capable of all walking treadmill bases in the market today. For a comparison between the three LifeSpan models click on the "Compare LifeSpan Models" tab. You can also read how these models compare to all the others in the market - including makers such as Steelcase (**), TreadDesk (*), Rebel Desk (*), Exerpeutic (*) and Woodway (*) - in our Comparison Review of Standalone Treadmill bases.