The main reason I purchased this unit was to build up my stamina in terms of leg strength. I was preparing for a marathon, 5k to be exact and it was suggested that I use a unit that encompassed a variety of exercises in one. I chose this unit because it does just that. It was really important to me that I build up arm and leg strength to be able to sustain myself during the run and the training I received using this unit was well worth it. Performance I gained tons of strength using this unit. I also lengthened my leg muscles, and that enabled me to train for longer periods without my legs becoming tired. Comfort Very comfortable unit to work with. Ease of Use This unit is very easy to work with. I experienced no issues using this machine. Durability I have dogs, cats and children. This unit is very durable, as it has stood up to them running and jumping around and on it since I have owned it. Design I like the design, as it fits with my other equipment very well.