Oh c'mon now, seriously? First of all, it's not L2JaCis, because if you compare aCis files now with L2J interlude files, you will find 0 similarities.
You all(those that have 0 l2j/java knowledge) say that aCis is good for mid/low rate servers... Is that because it's 100% clean? Because there are not stupid custom mods inside? Well, one thing: If you don't know how to add what you need in your server, then don't make a server. aCis is clean, you can code anything with these files, without having difficulties, like not being able to find what you want, because the classes are full with:
if (isDonator())
or
if (isStupid()).