Although a lot was made of DJ’s switch from his Scotty Cameron blade to the Spider Tour Black Jason Day was already playing almost the exact same putter in Red. DJ evidently expressed interest and the rest is history. Day’s model is basically identical except for a slightly softer Surlyn face insert.
One big difference is the addition of a new four-model structure with Tour (T) Players (P) Extreme Forgiveness (XF) and Super Game Improvement (SGI) now offered. But the real design difference has to do with the a new material used in the clubs that produces more speed and distance among other things.
The LO is the most compact model with a low and forward CG location that promotes a low-mid trajectory. It’s the most iron-like design of the group and is most likely to work for those with faster clubhead speeds.