Actually, the frame itself isn't lightweight and I think that with the complex helicoidal folding system and locking mechanism for the fork, it cannot be lightweight.

The lower weight is obtained with very low weight parts and some tricks like Tubolito ultra lightweight inner tubes and lightweight Donnely tires that seem not available anymore (the latest Ultralight Helix mention "TBA 24" x 1.4" (ETRTO 507-33), 75-100 psi folding bead with puncture protection" for the tires, Helix can try to have custom size tires made by Schwalbe like Brompton and Moulton do).

Indeed, the price went to the level most people expected after the launch of the Kickstarter campaign but is still lower than the price of the hand welded titanium Seattle Cycles Burke 20 (if this bike is really available ?)..