Nothing I've seen yet has caused me to worry, per se. I've seen a lot of interesting and fun-looking things (and some seriously gorgeous models), but at the end of the day it's a short-to-mid-ranged foot army.
The worst thing about them is that they're T3, so our poison isn't quite so delicious..
I think late-game PfP will give us the edge in combat (Rage + FC > Radiation)... other than that I'm thinking it's a "hang back and shoot" game.
Dunestrider is a cool rule, but basically mitigates the lack of transports for CC-based things... and those things aren't super durable. Multi-wound T3 = prime target for S6 large blasts.
I know a guy just itching to start an army of them, so I'm sure a lot of proxy games are in the near future... I'm excited to play vs the new set of dude-mans and see how they look on the table.