Well, I just tried rolling my partner's MuP8 as shown in the video, and I have to concede that wheeled this way is much better than my previous attempts led me to believe. However, I still hold that my Brompton has definite advantages in terms of rolling for several reasons. With the seatpost up on the Dahon, as shown in the video, to rest the bike you have to lower the bike gently because it will rest on the trouser guard which I would not want to damage. The footprint of the "semi-folded" Dahon is noticeably larger, with seatpost jutting at an angle, than my folded Brompton with seatpost up. You cannot rest the Dahon with the seatpost up because it wants to tilt over (I'd have to lower the seat every time I want to rest it down and back up to wheel again?). Perhaps worst of all, you cannot wheel it backwards (that may sound unnecessary, but I do it all the time to back out of or change direction in a tight spot) and again, I wonder about how one could wheel it with a bag attached (that's a big one for me). I can wheel my Brompton easily with full bag attached and the bike takes all or almost all the weight of it (depending on if I wheel it fully upright or slightly tilted back). I know all of this sounds like nit-picking, but I am so used to the convenience of my Brompton and I know from experience that these things all add up and make a difference in daily use. I can give my folded, seatpost-up Brompton a push and let it roll by itself half-way across a room - that's how stable and wheelable it is - even with a fully loaded bag attached to it. Also, there is no large shift involved in positioning it between parked state and rolling state. I can roll it either completely upright sitting on its 4 wheels (same position as parked), or tilt it slightly for added maneuverability. Just as an aside, I just showed my partner this method of rolling his Dahon - in a very positive way - look - you CAN wheel your Dahon this way! and I had him try it. I then asked him if he thought it was as easy to wheel as my Brompton and he immediately said no. We both also wondered about how reliably the bike would stay folded while being wheeled on rougher surfaces given that the bike is held together with a magnet, but we have no experience beyond our living room wood floor test.

I also tried wheeling the Dahon as shown in another video posted above, fully folded, seat-post down, pulling it behind me, and that was an immediate thumbs down for me. It looks really easy in the video, but what you don't experience watching the video is the amount of weight you are supporting that way and, as a tall person, the sensation of having to hunch down while rolling it. Setting the seatpost halfway up helps, but the feeling of lifting the weight of the bike still makes it feel like I'm being dragged down.

Bottom line for me is that I find my Brompton still substantially easier and more convenient to wheel than the Dahon. I don't mean to cast aspersions on the Dahon - as I already mentioned, I love the Dahon! It's a great-riding bike, but I would not trade if for my Brompton for all the wheeling that my commuting entails. It's perfect for my partner, though, as a recreation bike - pop it in the car trunk, drive to destination, take it out for a ride and back it goes in the trunk.