I don't know about the Zike, but if you are a big lad like me ( similar weight), then no the A-bike isn't for you!
I had one and kept falling backwards on it when I tried moving off. Even once I did get going the wheels are so small that even clipping a small pothole meant you are going to fall over!
I've got a ZETA II instead and fitted that to my normal bike, but it's not a patch on the C5!!
Cheers John