Gravity Strider/Airwalker

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I have a Gravity Strider Elliptical Trainer ( AKA Airwalker) made by Benysports. This works just fine but the LCD 'computer' does not function, a common failing with these models I am told.

Is there anyone out there that uses one that can give me an idea of the real life calorie burn that can be obtained with this machine. Online I have read that Elliptical Trainers can give about 800 calories an hour but since I find that even with an hour of vigorous use I barely break a sweat. At present I am guessing and entering 300k per hour on my exercise input.

Any users with a working Gravity Strider LCD please let me know!

Thanks...