I mean, actual Beastmasters. Not the beasts.
I just noticed that for 60pts, you can get the same amount of poison shooting from them as from a Venom. Granted for that small discount on your dozen poison shots you'll get only half the Venom's range at 18", and trade AV10 for T3. But, on the other hand, Beastmasters will move through cover without any issue, still get a 12" move, and can even engage in assault in a pinch (they can take Agonizers too, but that seems like a waste of points when you consider they have one attack base).
Seems to me like they'd probably be the way to go for some weird vehicle-free DE build - Kabalites and an HQ camping objectives, while pseudo-hellions and Scourges move 12" up. Maybe add a Corpsethief for fun. Or just if you wanted some sort of shooty blob unit.
Thinking I'll run some Hellions as a group next game to see if they contribute anything worthwhile.