Ok, I played 5 man Las/Plas squads with my Word Bearers, but after a while, I simply just dropped the Plasma Gun. For the most part, it was a non factor. Heavy infantry wouldn't get within range and heavy armor stayed out of its' range as well. I occasionally got some use out of it with careless deep strikers, but this was a rare occassion. After a while, I simply just saved myself the 10 points and dropped the Plasma altogether as my lascannon was the weapon that got all the use.
I keep hearing how great the las/plas combo is, but I find it to be of limited use. I can see uses vs. Tyranid big creatures as they tend to get in the 24" range, but that's about it.
Help me out, what am I missing here?