Biovores seem like they could be REALLY REALLY good now assuming that the synapse issue can be tolerable (otherwise like gaunts they will just go to ground by themselves).
I think I will try 3 units of one Biovore each.
They went down 5 points, gained a wound, and basically their weapons now can never really miss. (if they don't hit anything, no 6" minimum space anymore, it just it makes a d3 spore mines, and doesn't specify that they can't assault THAT TURN).