My warning about the Dye Izon is that its mounting system is poorly designed (a few small screws). It has fallen off my phantom several times (which has included retracing my steps until I find it). A field owner helped me out by dremelling away my stock feed tube to support the mounting system better which only slows the slipping off.
The Adco apparently gathers more light, is a bit bigger, and has a standard site rail grabbing mounting system. While I should've gone for the Adco, the Izon does hold its adjustments quite well (even after being put back on my gun after falling off).