Good machine - there is another model that is similar except for the belt One is a little softer so if you are going to use your treadmill for running you might want the softer one. I was looking for a unit that didn't take up the entire room so my focus was on size. Performance the unit has a 2.5 HP motor and I find that more than adequate. It has a range of speeds to choose from and if you are going to be using it for running you might want to check that out. I stick to walking so all I wanted was a slight incline and something that would be less intrusive in the room and should I really want to push it - a machine that could be changed to a slight incline. This is more than enough machine for the novice and I think even the most advanced walker will like the machine. Comfort I didn't know that their is any difference in the surface but this can be a huge issue on your knees and ankles if you do a lot of walking or running Ease of Use It has three windows that show you your speed, distance, time, calories used, as well as your heart rate. This machine has several different workout programs to help you obtain your goals. Durability I found that it had a better than average warranty. Five years on the electronics and lifetime on the motor and frame and they give you a years free labor. Design I don't have a special room to store this in but it doesn't look to bad in the bedroom and the unit itself is great and it works well to have it handy and a reminder that it should be used daily.