This is not picking on Quantum, I am not sold on any center or core drive machine. I think the concept needs a lot more time in the field before I start to recommend them. Quantum actually looks like they are making a fairly good machine from the quality of construction. I would still rather purchase one of the many front or rear drive ellipticals available on the market if it was my money... for less money. I don't relish the thought of being a guinea pig for a tiny company like Quantum.