If you are a walker and want a basic treadmill, it is hard to go wrong with this one. You really get much more than $100 worth of value if you step up to the TR1200i.
The warranty on the Lifespan TR800 isn't good. Parts and labor are covered for 1 year, while the frame and motor are covered for life. Unfortunately, this type of coverage isn't uncommon on treadmills that are this inexpensive.