I was running through the list of Legion WLs and making notes, and it occured to me several hours later that I had left Kallus completely off the list. I've never run him, or really even read about him being run. On paper, he looks decisvely middle of the road, with a DEF stat one lower than I'd like in most cases. That said, between his feat and Tenacity, it appears that he can find himself with very survivable 17/17 vs. ranged, and 17/19 vs. Melee.
Seems like there's a little synergy with models with crit effects, too.
What's the verdict? Anyone had much luck with him?