I have an easier time on the elliptical with my legs and feet... less impact, doesn't tend to strain my achilles tendonitis as much (which was caused, I suppose, by the strange gait I have when I run, since it was caused by spending a week hitting up the treadmill instead of the elliptical).
When you say you don't know anyone who's had amazing results from it... well, what do you mean? It's essentially just cardio, like the treadmill, unless you're putting it on insanely high levels of intensity to facilitate the building of leg muscles, in which case you might see a lower-body specific result.
My amount of time on the elliptical always depended on the day (back when I had a gym membership). I never forced myself TOO hard because I knew if I killed myself to the point where I couldn't breathe, I wouldn't be too inclined to hit up the gym again. But I usually chose a good cardio heart rate and aimed to get myself to that point, and make sure I was
sweating to do it. I was on there anywhere from 20 to 45 minutes, but... it was my sole cardio. I'd say 5 minutes is REALLY low, but if you've got other means of cardio (running or swimming or something as well), then nevermind, hehe.
