An upgrade from the Performance 400 model but still falls short in some critical areas.
Buyers on the lookout for extreme running options won't find their soul mate in the Proform Performance 600. For serious exercise routines that involve prolonged running nothing short of a $1,000 budget will do. If we ask you to miss out the 400 and 400C, the same advice applies to this 400 upgrade. Not a bad choice but not a great choice either. You really need to get to the $1000 range to get the minimum acceptable level of quality for a regular, average user.