Just received and am returning the gel challenger 13. The new "wingwall" thing is too prominent and digs into the outside of my mid-foot. At first I was expecting good things; 12s by comparison feel pretty soft and easy to rollover. The 13s w "wingwall" felt much more stable for lateral movement and really helps push your foot flat resisting any ankle rollovers. But I think my midfoot is too wide for this to be comfortable for more than 20mins.
So if you have a normal width mid-foot this is probably a good update. Heel cushioning feels thicker and more comfortable too.
I play on HC, like to slide, and am currently burning through what's left of three pairs of challenger 12s. Asics generally are a good fit for me, but not these.