Resident is where I started really grinding IIDX and reached 3rd Dan for the first time. I think the theming was great as well as the unlock system, and I found myself coming back every time I was at the arcade to hop on the cabinet and run a few credits. Having a full, native English release and being on a Lightning cabinet also heavily influenced my enjoyment of IIDX at this point: the upgrade from 60Hz to 120Hz is huge and I can't go back to playing on a basic cab now.