One of my OG Mako/Sprung conversions split, but after one skate I really like my new M7 conversion. The M7 actually feels stiffer than the OG Mako ever did, it fits the same and the weight difference is marginal (not noticeable while skating). The only real difference I notice is the thick white felt tongue vs. the thinner heat responsive tongue with the plastic metatarsal guard on the OG Mako. The M7 tongue doesn't naturally wrap as well and I had to fiddle with the lacing a couple times, but I'm sure it will break in with use.