Steelrunners and Skimmers are both Feruchemists.
I can't think of any huge life detriments, you could get pushed around easier, but you'd also be really safe froms falls. You could actually take up a second job as a stuntsperson, walking tightropes between skyskrapers and stuff like that.
Oh, definately.
They mention generators in TLM, but other than that nothing I can think of.