Seems that there's a new MD-X (V2), is there genuinely a difference between this and the first one? The upper seems updated though : r/RunningShoeGeeks
NB Spike Release: New Balance FuellCell MD-X - Top4Running.com
Track shoes/Spikes New Balance FuelCell MD-X - Top4Running.com
New Balance FuelCell MD-X Performance Review - Believe in the Run
New Balance FuelCell MD-X Performance Review - Believe in the Run
New Balance FuelCell Sigma MD-X Unisex | 21RUN
Road Trail Run: New Balance Fuel Cell MD-X Track Spike Review: Carbon Plated, Super Foam, Titanium Pins Super Spike!