Strida doesn't ride like a normal bicycle.

The Vellobike and Ahooga are much bigger folded and heavier.

Indeed the T-line has a poor transmission and poor brakes (for any reason, Brompton kept the same brakes as on the other models and not something better like the Ridea) but it has non competition when folded size, weight and ride quality are important.

Its easy to upgrade the brakes with the Ridea calipers and levers that are made for the Brompton. Braking is much better and they weight less. If top notch braking is wanted, same Ridea levers + eebrakes provide top notch braking and even less weight.

Upgrading the transmission is much more complicated. Its possible to find a 7s rear wheel that doesn't require increasing the OLD to 135mm but then there is the problem of the chain tensionning when the rear triangle is folded. There is no good solution for that. The Ltwoo Fold B derailleur is very heavy, ugly, low quality built and I have doubt about its long term reliability.

A major drawback of the T-line and any exclusive, expensive folding bike is that you cannot leave it anywhere unattended ! The T-line is a kind of worst case because anybody know the Brompton in Paris, anybody knows the value of that bike, its the dream bike for bike thief.