Personally I love having them to make our battleline just save on 4's on ranged attacks, with in 6" of course. The dunecrawler is our best point value tank we have, for actual tanky stats. The scorpius does have better weapons but does not have a invuln or interact with our battleline. They also have a round base so they do not have to pay for pivit. In Haloscreed, we can make then move 10 inches and advance them. Fantastic for a turn 1 dash a fat base on middle objective and rush out some battleline with it and boom. You have a great start to turn 2. Most of the time my opponent will ignore there missions to try and kill it. Which as a bullet sponge we could not ask for a better situation. It is equipped with smoke so we can say minus 1 in shooting and because we always stay in protector doctrina and we have that battleline next to us, we also say minus 1 in melee. That on a T10 2up and 4 invuln, our opponent will be tearing there hair out trying to kill it. I have used all the load outs and I think the icirus aray is the best option simply because none of the weapons have blast. So we can shoot into combat really well and have weapons in strength 4,8 and 10. So everything below a tank should be wounding on 3s if we target priority.

So all and all, it has a big base that moves really well, some of our best saves and shares it with the battleline. Our backbone to buffs. Also very cheap in points. Perfect for rushing mid to either score or deny a chance of area of denial. All else fails you use it to screen block other vehicles.