There are no guarantees in life. I would think if your bgs are fairly stable without any spikes or quick drops, you should see less complications. I also think it may have to do without how many meds or insulins you have to take to keep it under 6. The Accord Study found that when D's take tons of meds to lower HbA1c they actually had more complications. But if you are using diet, exercise and metformin I think you should be OK.