I am at Level 4-5 for 14 minutes! I love the machine and the energy it gives me after a workout. It doesn't take a lot of space, so it's perfect for someone who has an apartment.
I own M7 and yes it isn't cheap, but the quality is superb and worth it! I'm 36, and my mom is 63, and we both use it. She has slowly increased her resistance and time as well and is loving it. She started from 2-3 minutes at Level 1, having no prior experience with any kind of exercise equipment. Now she is at 10 minutes at Level 3. Her strength and overall fitness are improving noticeably.
I can't say enough good things about this machine. It is especially good if you don't have a lot of time to spend on your cardio. I have two small children, but I can always find 15 minutes to get this done.
Bottom Line: Yes, I would recommend this to a friend