I have a 2009 Ute. The only stability issue I have encountered is if I have a load that is particularly heavy in the rear, keeping the front end stable is a trick when walking the bike and getting on/off it. However, I have an Xtracycle Pea Pod seat mounted as far forward as possible for my two year-old, and her weight generally off-sets most of this. It becomes more of an issue if my 7 year-old is riding on the rack behind her, but that is due more to his inability to sit still than an inherent flaw in the bike.
This bike, for my purpose, is great for getting around town quickly and enables me to carry my two children and load of groceries without much trouble. That said, we are getting a Mundo for serious cargo hauling next month.