I got a great deal on Amazon for Bob's Red Mill Golden Flax Meal ($13.16 for FOUR 1-pound bags. I pay nearly that for 1 at my local grocery) and tried these.
It was surprisingly good and easy, especially sliced in half and toasted, as other posters have recommended. But I was surprised at the calories when I put the ingredients into Fitday. 400 for 1 bun! Add a slab of butter to each toasted half, and you're at 600 calories. That's a big chunk of the day's calorie budget. At only 1.5 net carbs and all the other healthy fat goodness of flax, plus 12g of protein, plus how quick and easy it is to make, I was hoping this could become a regular menu item for me, but at those calories, I will need to budget for it.