The wheels are strong, but if you kick up a branch into the spokes, they are more likely to bite dust. That's one reason why folks with strong hand built wheels carry more spokes. I only put 500 miles on them, but they held up fine. I think that the AC hubs are more of a problem on the unsuspended bike.
It's the rest of the bike I would worry about. They have made significant improvements in the bike, but it probably still won't hold up like a more expensive Bike Friday or Birdy would.
IMHO, the bike is fast, but only on perfectly smooth surfaces. My Birdy is much faster in general (or I'm in better shape). The new Kojack tires might have taken care of that problem as well. The upside is that it was a pleasure to fold and carry, and is very inexpensive for what it is. If you ride the bike infrequently, it's a good deal. If you plan on putting 15,000 miles on it, you might not get that far with your teeth all in one place.