We discussed a lot weight, fold and folded size, a little ride and fit (because we know little about that) but if we look at what made the success of Brompton, we forgot practicality.

The Brompton with its front bag and front block mounted on the frame and not on the handlebar + rear rack is a champion in practicality, you can carry a lot of things, even heavy things easily and comfortably (the bike behavior is little influenced by the load in the front bag and the rider doesn't need to use a rucksack).

At this point (I know it should come later), Helix doesn't offer anything for somebody wanting to use it as commuter : no possibility to carry anything on the bike, no mudguarsd to keep the clothes clean, no serious lights (no possibility to mount a hub dynamo). I am afraid that it also doesn't address the main weakness of the Brompton: comfort on bad roads (cobbles for instance). Helix has no rear suspension, a probably very stiff lefty fork (original lefty forks are suspended), relatively narrow road tires (no space for balloon tires).. A titanium frame isn't enough to provide real comfort (BTW, I have also major doubts about the ride comfort of the Burke, I do not think that he accepts 50mm wide tires ?).