Some runners make the mistaken assumption that the Lifefitness name makes this a runner's treadmill. Don't make that mistake! These are at best an entry level machine.
A very solid unit. So solid, you forget it is a folding treadmill. With that said, we have heard from a number of customers who have bought a Lifefitness entry-level machine and have found it to fall apart with heavy use. If you need a heavy duty folding treadmill, the Sole F85 would be my pick. If you want more features, go with one of the NordicTrack folding treadmills. They have more features with fancy touch screens and you actually get a better motor for a lower price.