Anyone use an ElliptiGo ? (Expensive Elliptical Bicycle)

If so, what are your thoughts?  Good workout?  Fun? Any negatives?

http://www.elliptigo.com/?gclid=CLzyj9bKtssCFQQEaQod90IMfw

To me, it looks like a cute toy. For one it looks like you can only ride it where the path is smooth with no potholes, cracks in the sidewalk, no hills etc. Their top of the line item can hold a max of 250lbs. Not sure how much their low line item can hold.

I like to ride & one thing I've noticed is that when I ride a bike with smaller wheels (think fold up bike), it feels very flimsy, more like an adult trying to ride a bike meant for kids, any little thing in the road, like small tree branches or really any little rock you roll over throws off your balance. The wheels look almost the same size as my fold up bike, so I'd imagine the feeling would be the same.

Thanks for your insight.  Good points to consider.  I did find a place locally where they rent them out, so I might go try one for fun, but will probably end up buying a regular bike.