HE RBTs

I always used to take them in a HE army. They seemed to be an automatic choice which appeared in the list without thinking. However, I eventually came to the conclusion they were not doing me any favours.
For their points I can't seem to get them justify their inclusion. If they are in the list, they become targets and get a round (or two) of firing before they are picked on or taken out. OK, so that means they have the scare factor for an opponent but it's not much effort on their part to remove the problem. Not taking them has suprised a couple of opponents who were expecting them in a HE army which is always nice (if they took units to deal with them!) but let me know how you use them or what you think about them.
I might try them again. Maybe I'm not using them right or with the right support or combinatio of other units/magic/firepower...
For their points I can't seem to get them justify their inclusion. If they are in the list, they become targets and get a round (or two) of firing before they are picked on or taken out. OK, so that means they have the scare factor for an opponent but it's not much effort on their part to remove the problem. Not taking them has suprised a couple of opponents who were expecting them in a HE army which is always nice (if they took units to deal with them!) but let me know how you use them or what you think about them.
I might try them again. Maybe I'm not using them right or with the right support or combinatio of other units/magic/firepower...