Really? I think I spoke to the same very nice lady yesterday and she mentioned that the EVL 4 would be a better option (+sidekick when i'm ready to sub) since i'm still on contract with my current monitoring station, but may want to subscribe to their monitoring in a few months. I had ordered the DUO but cancelled it based on that. basically I would want to use the EVL4's regular functionality (and integrating with home assistant, etc), and have the option to sub to their cheaper monitoring in the future.
Maybe I misunderstood what she was saying and the DUO can accomplish this (and is much cheaper than buying the EVL4 plus sidekick).