I looked at Swissbikes (Montague) and Airnimals before getting my Dahon (at around the same time as this thread as it goes).
The way they fold made them one compromise too much for me, and while the price of the Airnimal put me off, had it been the perfect solution, I might have paid it.
As it was, the Dahon Matrix was the bike for me. The original one with the cam hinge was far better in terms of folding, literally under two seconds and it was folded/unfolded, but the lock-jaw version always felt more stable - did mean always having an allen key though - and looked more like a 'proper' bike . So much so, that I constantly had train guards stopping me as I was walking towards the train with it still in 'ride' mode.
Interestingly, in terms of the length, they had much more usual geometry compared to a Brompton. I did have a pic of my Dahon against an M type B, but I don't know where that is.
In use, it wasn't that practical for me. My trains were often overly busy and several times I had to catch a later train as I simply couldn't get on with the bike. It also wouldn't fold small enough to go in the back of our Mini.
Not to mention the fact that both Dahons I had snapped.
For me - and it is only for me - the Brompton wins out every time due to the size of the fold. It's no slower in day-to-day riding for me. Though the furthest I've been in one day is a 40 mile round trip. Plus it hasn't snapped.
