spawning of Bob said:
Yes to all of the above, but check the stats
Cold blooded leadership 9 is a 95% chance of success without reroll. Vs 98% for leadership 10. With reroll is 1 in 400 chance of fail (vs 1 in 2500).
Ask yourself. Do you feel lucky, punk?
http://www.lustria-online.com/threads/cold-blooded-probability.10479/
Also look at how often you are taking those test.
I'm running 3 units with stupidity and 3 with frenzy. I can be taking 6 tests a phase, just be being on the table. Over the course of a game, it's 20 tests; before you start to look at panic and break tests.
Also, LD10 is really great; but Ld10 is a whole lot better than Ld9 when you lose combat by 4 or 5.
I've seen LD10 come up maybe once ever other game. Is 15 points worthwhile saving a 150 point model every other game? I think so.
-Matt