My friend in Sussex had one. It snapped...
any details of the break?
If looking at a used one (the only sort now I think) it is prudent to inspect the rear wheel fixing carefully to make sure it isn't damaged or seized up. The low gearing stems partly from the use of a screw-on freewheel (on the model with gears) and this would presumably be one of the cost-cutting corners. If you only have a 14T smallest sprocket, chances are that if you fit a large enough chainring to make up for it, it would be so large it would interfere with the folded size.
FWIW there are various ways of looking at the single-sided design; one is that it makes fixing punctures easier and makes the fold a bit smaller for nothing. Another way of looking at it is that these gains are footling by comparison with the loss of structural redundancy that occurs in a traditional bike frame, and folders are bad enough in this respect already, so why go out of your way to make it worse...?
cheers