Spirit Fitness does a great job at making durable treadmills with long lasting warranties. The Spirit XT285 is a slight upgrade from the XT 185. The main differences between the two are the number of workout programs, the max speed, the max incline, an added wireless heart rate monitor, a stronger motor, a longer tread belt, an added mp3 port, a higher weight capacity, and a stronger warranty. This is a great deal for what the extra cost is. The motor has 2.75 hp which can accommodate heavy jogging and light running. There are an additional 2 heart rate workout programs included in the XT285. The max speed is 12 mph and the incline can go up to 12%. The weight capacity has been increased for this model up to 350 lbs. The warranty that covers parts has been increased to 10 years. This is a good model for those looking for a treadmill with stability, but do not really want any functional programming or interactivity.