I've been wondering about the difference as well. Hockey Monkey lists the Mako II as 840 grams and the same size Mako M8 as 852 grams, so only a very slight difference in weight. Over in the Easton catalog thread, I asked if anyone could clarify what the material differences are between the models. From what I recall reading, the original Mako had a Texalium composite shell, not carbon composite. I don't know anything about how those two compare in performance or anything, just that they're different composite fabrics used in similar ways for composite part construction. What's potentially significant about the difference in Texalium on the original Mako and composite on the II, M8, etc. is the catalog lists a C-number, which could be the carbon content of the fabric? From my understanding, carbon can be substituted for fiberglas or other heavier materials, with similar end performance, just with higher stiffness in full-carbon fabrics and less in those containing some glas, etc. In the case of the 3-tiered Mako line, the C-numbers drop from C-100 to C-80 and C-50 from the top of the line (C-100) down to the bottom (C-50). I'm guessing at most of this, so anyone with better knowledge, please correct my misunderstandings. If I'm reading/guessing right, there's a 20% glas (or similar) content in the M8 compared to the Mako II and that doesn't make for that much of a weight increase.