I have mixed feelings about Dahons.

The good things are that they have a pretty good fold, the company updates models every year, and they cover a wide range of bike types and prices. They've gotten better at making the bikes a little more adjustable.

The bad things are that they tend to have some proprietary parts, which a few years down the line can be hard to replace if they break; and the handleposts tend to be very flexy. So it's a bad plan to pull back on the bars, especially when climbing.

IMO they're very good for some tasks, especially commuting and general riding. If you think you will ride 100+ miles a week, I'd opt for something a little more solid.

One caveat on the impressions of negative comments.... Dahon is by far the largest maker of folding bikes, so in general you're likely to hear more comments (good and bad) about them than any other maker.