I've used them and love them, especially for running Bushies. Basically it works a lot like the Armageddon, with the interesting added bonus that rather than having just a tank without the front reg, you have a screw in nitro that you can use elsewhere independently. Heck, they even look alike. Only thing about it is though that because of this, it is a bit longer than a Geddon, but far cheaper, just slightly over half the price.