I played a game yesterday, just a quick one 5 man/woman squad aside. I used the hobby stores Space Marines, and seeing that they had a small Sisters of Battle squad in a display case, i took them out and used them to show my friend how to play.
We just had a quick game, showing him the ropes, but the Sisters of Battle performed amazingly. I was stunned. That one 5 woman squad managed to survive a hail of bolter fire, and then about 7 turns of CC (we kept going at it trying to see who would break combat first and run) killing 3 marines to themselves, and suffering no losses in return. They just refused to break, and refused to die. I was so shocked.
Im sure that im probably exaggerating due to the small scale of the game, but still...it was really surprising. I expected them to be beaten down like a bunch of little girls (no pun intended) and they held their own. The manager of the store subsequently told me that the winner of the last store tournament was SOB!