Join Date: Jan 2012
Location: Cadian Battle Cruiser "Divine Wrath"
IG - yes definitely. Tbh survivability was poor per guardsman regardless of whether they are boxed or in a huge blob, so the huge rapid fire buff will make them more effective on the march, and they're so cheap its not really a big sink to do so.
SoB - it depends on how much of a point sink they are - if its a large component of your list, then i would say no, but if the 20sisters are a small part of your list, then maybe - and you can always split them into two separate squads if you think they are too vulnerable. High value blobs (like 20 CSM or 20 sisters), will get a high target priority because they're hard to stop, so they will draw lots of fire, which is not ideal if you're wanting the blob to be VERY effective beyond acting as a sponge.