Look at other threads in this forum. The Piccolo is twice the price and not available everywhere (especially hard to find in Eastern Canada), but it is much, much better.
In defense of the Addams, I would say that it was very stable at first, before the universal joint wore out. Since most people won't ride 1000 km in the lifetime of the bike, it serves their need fairly well. But since I ride much more than that each year, I obviously need a system that won't wear out.
As far as the Piccolo is concerned, I had to replace the rear wheel during the first winter, because it felt like it was rolling on salt rather than bearings. I replaced the cheap hub with 6-speed freewheel by a LX hub and a 9-speed cassette.
And after 3 years of intensive use, the Piccolo needed new bearings in the cranskset and in the articulation. Total cost of the job: $60