Maltitol (Atkins products, Thornstons sugar diabetic etc) has a GI of 36! I'd avoid it like the plague.
If I could be eating coconut Atkins Endulge bars for 1.1g of 'impact carbs' and Thorntons chocolate and fudge etc this would be the easiest diet ever.
After seeing that dreamfields link Jim posted, if it sounds too good to be true it probably is!
I only use Atkins RTD shakes (no polyols), Heinz one carb ketchup (sucralose) and Joseph's pitta breads (4g carbs) outside of the meat, eggs, cheese, fats, nuts, seeds, low carb veg and berries.
My mum was having an Atkins daybreak bar for breakfast each day and lost nothing in week 2. They are the devil!