Furtive Chase is solid. I mean I guess because it's not slowdown or information and its trigger condition is situational. It's also not very good for tunnelling. Yeah now I think about it I know why people don't use it, but I do. I'd like to use Machine Learning but I enjoy Surveillance too much and both highlights generators yellow. For some reason BHVR doesn't want people running certain perks that make generators yellow because they haven't thought to make gen coloured perks different colours depending on its position in the load out. It's certainly not a balance thing.