Woodway Treadmills are considered to be the very best of the best. They are used by many pro athletes, at the Olympic Training Center, and high-end fitness centers.
There is lots of info available online.
This is the Path model.
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A Woodway truly is the World's Finest Treadmill, designed to provide the ultimate in user comfort, whether it be training for your next race or improving and maintaining your fitness level. A Woodway treadmill is designed and built with the superior slat belt running surface that is softer on joints and connective tissues and lasts longer than conventional belt and deck treadmills. Woodway treadmills can be found in the homes of celebrities, professional athletes and those who demand the very best in all they own.