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Fold is super easy - quicker than a Brompton. Just 2 big clips to undo, fold in half and drop the bars down. A little rubber bungy keeps it together. Where it loses out to a brompton is the seatpost doesn't drop. To go fully small you take it out and slide through the rubber strap.
We rarely do that. With the seatpost in it rolls along very nicely.
It's significantly bigger than a brompton though (bigger wheels for a start) and no folding pedal. But it fits in the small boot of our Zoe fine. Less twitchy more normal ride feel.
If you want I can take a pic of the two of them folded side by side later.
Decathlon? There are lots of what look like shitty ones about that might do for occasional and short journeys, but I think you get what you pay for. Depends on the use case really.
(Though I say this from the POV of having a G4 which is great).