I lost 45 pounds by using the Elliptical !
You are training all of your muscles while you are on it + it's fun. And if you want results you should do an interval training
. Just try it for sometime with normal speed and then go faster for a while... until your hearth rate gets up. Then, again slowdown for a while and when you're ready try harder again. This way you are not bored with your workout and you'll get your results faster. You might start with 30 minutes and then just start adding more minutes when you get used to it. Good luck and enjoy the journey