AFAIK, no large-scale public servers use this. Why do you think this doesn't have potential? I think Hendi has done more than prove that this source can be better than any Odin source. The only reasons I can think of that people don't use this is because 1) he's the only one developing it, 2) there is little to no customization when it comes to non-GMS, 3) there is no real "support" other than this thread, and 4) though the server is great, there are no localhosts. There are some great guides on how to play loopback, but they can't play online with their friends across the world. What I think most people fail to realize that DelphiMS is actually revolutionary to this section. Now why do you think people like you can come in here and say that this, and the Delphi language, "sucks"? Simple answer, because you were carried here on Java. You were babied in to thinking that Odin is the only way a MapleStory server could possibly be run.
Stay out of this section until you can respect a source by the author's hard work and dedication, and not because you think the language it is programmed in "sucks".