yea i have found that a few sqds of them are almost a necessity in my deathwing list just due to the low model count that a pure deathwing list gives you and after all they are space marines so it is not like they are slouches. another fun trick i found when playing around with my deathwing is to add a scout sqd with sniper rifles and camo cloaks take a cheep fortification and stick them on it the 2+ cover save along with the fire power they bring to the table make them relay fun to play around with plus they are realy cheep so they free up some points to play around with in your deathwing sqds almost a win win there. just a few ideas to play around with though
"There's too many men, too many people, Making too many problems,
And not much love to go round, Can't you see this is a land of confusion?"