Apparently the Millenium is just a third-party distribution deal, and has little or no customer support. I don't know about programming the UR400, because I haven't seen it or it's docs (some units may hve shipped without documentation). In the meantime, the UCommand works perfectly, as advertised, and has full documentation and support, including a new FAX on their website. It is available directly or from other online stores. All these things (apart from my personal fondness for the unit itself) make it a definite preference.