As I've used it in the past, and was relatively happy with it, I decided to buy Truvia (a no-calorie sweetener made from Stevia) to use as a sweetener, as it seems more natural to me than the other forms of sweetener available. Guided by the information on the pack, I used two teaspoons of Truvia, equivalent to 6 teaspoons of sugar. Other than that, I followed the recipe exactly. One point to note about the recipe is that you need to cook the apples in the honey ahead of any other preparation, as they take a while to cool down. Apart from this stage, the recipe is fairly standard and simple to follow. The muffins produced rose well and looked really good.
Unfortunately the looks promised much more than the muffins actually delivered! I found the texture quite stodgy, and the muffins stuck really firmly to the paper cases, to the extent that quite a bit of the muffin was lost (unless you want to scrape the case for every last crumb). I could have overlooked this if the flavour had been better, but I found the muffins quite bland; I couldn't taste the spices at all, even though I could still smell them in the baked muffin. In addition to that, the presence of the sesame oil was more of a scent than a flavour - after the first mouthful, I didn't really notice it. The pieces of apple were well flavoured, but didn't make up for the blandness of the crumb.
It's difficult to assess the claim that these are low calorie - 190 calories per muffin - as it's generally only muffins that claim to be healthy (and often found on diet and healthy eating websites) that give a calorie count. The nearest basic apple muffin recipe I could find, with no claims to reduced fat or sugar, contained 250 calories per muffin, but I'm afraid, even with a 20% reduction in calorie content, these disappointing muffins weren't worth the calories. 190 calories is quite a big chunk out of a restricted calorie diet, although I think Tom was suggesting eating them for breakfast, not as an extra treat. If you do want a treat there are a lot of tastier ways of using that number of calories - most involving chocolate, I have to say!