The T3 is essentially the foldup without the extra parts that make it fold up. Quite a decent unit but those serious users will discover that this is a Lifefitness in name only. It lacks all of the serious horsepower of the club units.
The entry level model for those who want to tell others that they have a Lifefitness in their home. We have had more complaints over the past two years with longevity problems with the entry-level Lifefitness models. If you need a real solid treadmill and have $2,600 to spend, you are much better off with a True or a Precor. You can also save a few bucks and get an excellent treadmill with a Yowza. Lifefitness really falls short in their models built exclusively for the home!