My old treadmill died after 10 years of service. I did quite a bit of research and narrowed my choices down to two. I found the Lifespan product had a better motor and a longer warranty. I phoned Lifespan and spoke to an associate Bryan, who in turn gave me a great deal on a Lifespan TR4000i. Delivery was prompt and I chose to set up the unit myself which was a snap. The TR4000i is a solid piece of equipment the cushioned deck is awesome on my aging knees. Not only is the unit quiet but it provides a stable platform to get a quality cardio workout. My wife and I could not be more pleased with our purchase.Do yourself a favor and purchase a Lifespan product you will not be sorry.