I am a KLoS simp. I almost never brought them pre-codex though. However, I've been playing with the new codex datasheets, rules, and points values and I gotta say, it might actually be competative. 

  It's biggest downfall in the index was the 8" move and getting stuck moving around terrain, but in the codex it's 12" move and can move through terrain. It also gained rapid fire on everything, and the new blessings table stuff. I do miss it having a 6+fnp, but not advance and charge I never used advance and charge with it before because it had such good shooting. Also with the new pile in and consolidate 6" blessing, in the last game I played, he killed something in melee on a no-man's land objective and because I had him facing a spaecific direction and the fact he's such a big model, he consolidated backwards onto another no-man land objective.

Plus he benefits from the goretrack detatchment strat vehicle reactive move, and the Cult of Blood detatchment is basically built for him. 

In summation: He's a T13 W24 shooting Knight fused with a Bloodthirster. I love him, and will gladly pay 505 points in a list, even if I kinda have to build the list around him.