No the are not any good they are a f***ing massive lump of bollucks! You look and feel like a total spazz and the movement feels so bizzare I cant use one for more than 5 or 10 minutes before I get so angry I throw the thing out the window.
I have a mad hatred of nordic ski machines and cross training machines. Just run.
Hope you are not hoping to join the forces in that case?
If training outdoors is not an option then why not just use the treadmills and rowing machines at your local gym. Rowing and running are definately my favourite forms of cardio exercise, much better than a pussy ski machine anyway.
Haven't got one of those but i do have a cross trainer and love it. On the occassions that I cant get out for a run or get to the gym, it does a good job at filling the gap.However dont buy a cheap one, get a decent substantial one. Also if you are a bit of a tv addict, there's no excuse, just use it whilst watching your fave programmes