This will pretty much help any user from beginner to experienced. Gatsby plans to do some further tweaks, and implement features from the combat helper when he has the time, which will make this next level. You will still need to understand how to do the inferno so that you know what prayer to start with, how to use the pillars, and dealing with stacks of NPCs, but this is like putting prayers on semi-auto pilot.
Any significant spikes in network/computer/server will usually cause missed pray flicks, so be aware.