Montague bikes are heavy indeed, but it is mainly due to its sub par components. And ALMOST ALL folders have very cheap components compared to 'normal' bikes with similiar price range. (Bike fridays, Moultons, Bromptons, Birdys.... Sole exception is Dahon IMO)

However it is kind of mixed blessing. You can fit standard MTB components to montage frame, making it a reasonably light and good folding bike that can be ridden in rocky mountains(My montague weighs 9kg). But if you want to ride it without any modification, I think cadenza will be suit you better.