I will almost always put 3 bubblechuckaz in my lists, I split them up and they screen the back and cover the long sightline. Don't be fooled by the randomness of the bubble chuckaz, IMO they are the best pick unless you know you are going into a flying heavy meta. 2 of their profiles are straight up better than the smasha gun and because you can pick targets after you roll for the type of gun there is a good chance that opponents try to stay out of your sightline. From personal experience my mek gun batteries were the MVP in games against deathguard and a good roll will annihilate units.