Avoid in starting gang.
Later on a pet is useful if your fighter seriously injured someone nearby with his bolter, the pet can charge in to KO.
Pets are even more useful in campaigns that cap your fighter limit as they allow each fighter to take 2-3 extra models over the limit (as pets are...
Upgrading Willpower is usually a waste.
Just spam Fast Shot plasma cannons. Multi meltas, grenade launchers and other template weapons also ignore the masks (by targeting ground nearby).
Unless there are walls/cover everywhere, Corpse Grinders do not stand much of a chance Vs van saar
As a Van Saar player I definitely don't plasma gun spam. We have multi meltas... :)
(Note: always take a flamer or template weapon to deal with infiltrators, Falsehoods and the rare melee peep that manages to make it through the wall of gunfire. Someone said Van Saar need close combat...
In our group, one of the members has devised this means of play with Helamites:
1. Storm callers reduce visibility to 6" meaning you cannot target outside 6"
2. Helamite 10" away rides 8" towards a model, uses their Versatile weapon as a ride by attack without any reaction from the victim