I tweaked the recipe slightly and love the way they turned out (so did my husband): I used agave instead of honey and added just shy of the 1/2 C, added an extra handful of blueberries, and did not sprinkle the tops with sugar. The sweetness of the summer blueberries was really the star (I could maybe use 1/4 C agave next time). Also, I have a cornbread recipe that calls for letting the mixed batter sit for 30 minutes or so to help combat dryness; I did that here and the muffins turned out nice & moist (not sure if the "sitting" was the reason, but I don't think it hurt).
Pros: Great texture, wonderful taste
Cons: original recipe calls for sugar