The most important thing is to find the one YOU like best and stick with it.

I used to use a cheapo/generic cross country machine back in the early 90s. When I decided I wanted to lose weight and work out, I was really leaning towards an elliptical or treadmill but my BF found the Nordic Track at a yard sale for only $5 so he bought it for me. The best $5 ever spent!Funny you mention that one, Judy. I dusted off and cleaned my Nordik Trak back in August and have been doing it ever since as my main source of exercise. I agree, there is some "getting used to" how it works, but its like riding a bike. It's a great way to get your cardio in, and I enjoy mine quite a bit.
I decided to try the eliptical today.I'm not sure weather the eliptical, bike, or treadmill is good for me.
So when/why did the cross country ski machine (Nordic track) seem to fall out of favor.
Basically, they overextended their company. The NAME was purchased by ICON fitness. They now make a ski machine (didn't originally - some clause in the purchase contract), "classic pro", but there are differences to the original machine. (besides being made in china). The genuine, made in the USA, ski machines are no longer in production. However, they were so well made, with proper maintenance, they will last forever. There are a number of places on ebay/online that sell refurbished ones (beware as some are just plain used as opposed to overhauled), as well as replacement parts, including free instructions, to do it yourself and keep yours in top form. One seller is a trained Nordic Track technician from over 20 years ago. You can also buy the parts to upgrade the features of one you already own. 

I am quite new to exercise, I started in December last year. At the moment, I have got myself up to doing 65mins on the X-Trainer, 40mins on Bike and 20mins on Rower. I love all three because I watch the Simpsons on my mobile phone whilst doing them all (apart from the rower)!!
I also try and make sure my heart rate is above 180bpm for all of the X-Training, which is really tough but is very enjoyable when you pass the pain barrier. Not sure how I will feel once I run out of episodes to watch!!
I think once I am below 180lbs, I will start using the Treadmill, but until then, I will stay on X-Trainer, Bike and Rower because they are all low impact but high intensity (depending on resistance and effort, obviously).
I think to summarise, do a mix.. you will soon find the one you know you can stick at.

Trust me, I break a sweat just as quick! I am probably doing it all wrong. I have been told by lots of people that I should only do 20mins max of intense exercise. But between you and me, sometimes I have a sneaky McDonalds for breakfast, so I feel really really guilty and ramp up the exercise to burn the equivalent of (what I ate + all my normal exercise = lots of pain) so I can go to bed with a clear consience!
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