I've heard that ARB won't warranty a locker if it breaks and a non ARB compressor was powering it. I don't know if that is true or not. I can't see why unless you put too much air to the locker and it blows a seal or something internally. I say go with the ARB. They have been definitely tried and tested. Another company from down under is Jack Macmanara (sp?) lockers. I'll search and see what I find.