I got to try this elliptical trainer at a gym, although it is designed for home use, as I was told. Precor EFX 5.21i has 6 pre-programmed workouts to choose from, where the machine will change speed and resistance for you as you exercise. You can also do that manually. There are 20 resistance levels, so if you are a beginner you can start at the easiest one and then work your way up. You can also change the incline: the higher you set it, the harder it is to exercise and the better workout you get.
As you exercise, you can watch your progress on the monitor: your speed, step count, heart rate, how many calories you have burned, etc. Resistance and incline level will be shown on the monitor as well.
Precor EFX 5.21i is quiet, I can easily see how someone would place it in their living room, in front of a TV set without worrying about the machine being too loud. It runs very smoothly, without those mechanical jerks I have experienced with some other machines. One thing I do not like about this elliptical trainer though is that it does not have arm levers. With those, you can exercise your upper body as well, not just legs, thighs & abs.