Topcoat is basically some pre-made materials but per-channel. So, pre-made presets for Reflectance, bump, etc. IMO, It's not worth it. But, It could be helpful of course. Saves quite some time. Signal on the other hand is a whole new story. It's a Non-Linear AKA Procedural animation system. It's a whole new way of animating stuff and it can be huge timesaver in some projects.