This is an excellent treadmill for runners. I have been a runner my whole life and am always looking for good treadmills. I prefer running outside but am often stuck inside due to the times I can workout. This treadmill is one of the best at giving me a great workout indoors. It has a great deal of features on it. These allow you to modify your workout to what you want. Therefore, you can train multiple ways. You can set it for sprints, hills, intervals, or many other options. The belt runs smoothly and it has a place to hold your things. I have not found anything I do not like about this machine. It is wonderful and I would highly recommend it. Performance Performance is great. It has multiple features and gives you a variety of workouts. I always have great workouts on this machine. Comfort The belt runs smoothly and comfortably. Ease of Use It is very easy to use. It has a lot of features but they are easy to figure out. Durability I have used this for years with no problems. It holds up great. Design I love the design and number of features.