I've found in general the x27 works better in wet and/or stringy wood. I have a normal 6lb and 8lb maul to compare it to. The wet and stringy stuff the normal mauls just bounce off. The x27 may take a few swings but as long as I hit the same spot I will get it split in no more then 3-4 swings. The biggest I have split is 30" silver maple and 28" black walnut, both 18" long. A few swings of the x27 and I can split them down the middle usually. For dry hard stuff the x27 just sticks in it where the normal maul will blow it apart. Also anything that is excessively knotty will usually just reject the x27 where as the normal maul will eventually get it apart. I was also able to split sweet gum pretty easily with the x27 where the normal maul was a measure of frustration. For me, even if the x27 might take a little longer to split, I can swing it for easily twice as long as the normal maul. What I would like to see is a 6lb or 8lb version of the x27. Would have the weight to handle the nasty stuff, and the head shape that seems to work pretty well.