I haven't messed with them a ton. I am running a mixture of medium and low settings and getting 35-40 FPS. Battery life is about an hour at full charge. It's playable and fun but hopefully they will have some optimizations eventually.
Huh it was borked when I last looked and doesn't nguard not work on linux? I couldn't find any statements by the devs. I have a feeling this is more of an oversight then them caring about linux players.
It runs, unless you have very high-end cards where users are reporting crashes. The fix is to restrict FPS to keep your GPU mhz lower. Mostly AMD people but I have seen complaints from a couple team green too.