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ProForm Performance 400c Treadmill Review. The ProForm Performance 400c treadmill is underwritten by a 25 yrs warranty on the Motor together with a 1 year Parts and Labor warranty. My wife and I are first time treadmill users and picked the 400 C because it was a middle of the line machine with lots of options. Proform performance 400 s treadmill review Sherwood Springs Jan 25, 2015В В· This is my review and first impression of the ProForm Performance 400 treadmill I bought from Sports Authority. Also demonstrate how to calibrate the walking belt. Part 1: https://www.youtube.com