This is going to sound weird but I think Seidr might actually be the brain damage ID. Sorry Cybernetics Division, I have tried to love you, but its over.
What does spending/losing s mid-run have to do with brain damage? Spending s is how you turn the nasty brain damage facecheck penalty on Viktor 1.0, Heimdall 1.0 and especially Heimdall 2.0 into a gentle "miss half a turn". Seidr tips that end of the scale by also offering recursion, which is going to force some runners to take it on the noggin to keep that away from you. If you're mad you could even tip the scales back the other way again for a pretty severe catch-22.
In general a lot of lost s during runs come from ICE subroutines, so Seider makes facechecking more dangerous. Therefore, if you rush to score out, you can force the runner to run while your ID still has teeth on those nasty facechecks, and maybe you can threaten a kill if they go too fast and end up reducing their handsize.
Even with Engineering the Future gone Seidr has stiff competition from economy HB IDs. Sportsmetal in particular can rush faster and keep tempo while trading agendas with the runner. But none of these are quite as cool as Seidr, and if you went out of your way to look up reviews of this ID that won't deter you from having your fun.