The mezzo d10 is a lot faster than the Brompton. The undergearing is marginal and is compensated for by a large crank. It's far more comfortable than the Brompton paticularly if you are touring and parts can be bought for as little or as much as you want to spend. You can shop around which you generally can't do with the Brompton. Here in Dublin there used to be several shops which sold them but as they have sold out they have not restocked for some reason or other. Go for it , they are wonderful bikes.