Okay...so it's not a *great* design...
I certainly didn't think it would have the performance of a properly designed bike and the sliding frame design looks a bit sketchy to me, but for a hobbyist project it seems okay.
I think a bike like this would be more suited for a slower ride on the MUP with my girls, but still it has it's place. I think it's like the beach cruiser version of recumbents...and this one is purple!