NIKE Metcon = US10Reebok Nano X = US10 (fit sung but with roomReebok Nano XI = US10 (fit larger than Nano X - I could have probably sized down .5 and been fine)Reebok Nano X2 = US9.5 (fits like NanoX)Use Case: 7 Days a week in the gym/general purpose: cardio (stairs/row/battle ropes/bike), throwing weights around, everything but squats or deadlights (as I use Reebok Men's Lifter PR IIs and Reebok Power Lite Mids, respectively, for those exercises).The Nano X2 is more like the Nano X than X1 (thankfully). After much use, I was not a fan of the X1, the shoe 'bagged' out really fast and lost all support allowing my foot swim around.Great fit if you have wide feet and are not worried about rope climbing.- This is not a minimalist shoe (like the X1 was).- The tongue is shorter/lower/not as puffy as the X/X1- Feels lighter than X- Feels heavier than X1- More cushion than X1- Similar cushion feel to X- This is NOT a running shoe (just like the previous versions) - you've been warned!Reinforced toe box and eyelets (this lends to the stiffer feel over the XI). Note: The eyelets area is wide (it's a wide shoe, even mid-foot) and you are not able to force them to lace super tight, i.e., get the eyelets super close to each other without buckling the front of the shoe at the first eyelet).Where the Nano X1 had a very loose/thin upper the Nano X2 is a more solid shoe all around; much less side to side play and overall stiffer materials. It hugs your foot yet very breathable.Wide toe box like the Nano X, similar stability and cushion.Heel clip is nice, feels a bit closer to the stability of the X1 than the X. Enough width and stability that you could do medium-heavy lifts, but they might not be enough shoe for big heavy PR sets, Olympic style lifts or.For true cross-fit, I'd say they are at a disadvantage in the rope climbing category as they are not reinforced like the Metcon 7 or 8 (which runs much narrower than the Nano line).