It's pretty SHARP lookin, and very unique.
If you haven't filled a plain tank with a Killer RBA it is hard to explain but it is a real pita. My first Killer is living in a tank that has a side plug but it floods when filling as the juice leaks into the atty as long as the plug is out. With a bottom fill the juice feeding hole is out of the juice while filling. A top fill like the Kir Fanis isn't too bad but the screw plug interferes with large diameter pipe stems. A bottom fill solves all those issues.