I took a long hard look at Mark of Xenos today... and didn't like it. The issue is not specific to FFG material, or DW material, since the previous DW expansion, Rites of Battle, was, in my opinion, brilliant stuff. RoB delivered pretty much what it promised and then some. Mark of Xenos did not. Its not about the quantity or quality of the material, but what was chosen into the book. Frankly, from Deathwatch "monster manual" I would have expected the unexpected. What we got was new statlines for "the usual suspects" a few new heretics and thats it. Next time I need something new and interesting to throw at Kill Team I'll pick up Dark Heresy Creatures Anathema or Diciplines of the Dark Gods.
What are your feelings on MoX?

Indeed! Big mean space bears, only worse cause it's 40K! Hilarious, but, i fear, true. And good to know they are spread around (i had kinda assumed they were from one planet, can't remember which chapter fought them).