The benefits are obvious: someone new to using ROM hacks no longer needs to be told to also download a patcher (typically Lunar IPS)… with additional instructions in case he may be using a non-Windows platform, and with the potential problem of the program no longer running on current systems, especially in the case of the Mac: this happened for PowerPC-compiled patchers, it could happen again.
(EDIT: replaced beta URL with public release URL) It differs from previous patchers in that it is web based: you use it the same way regardless of your platform, and you don't so much install it as just navigate to an URL: JPS (stands for Javascript Patching System) is a web app that applies patches, currently IPS patches.
