OK.
I started this thread a few weeks ago, undecided, M1G vs. OPII
I've now decided to go with an Elk M1 because:
1. Although HAI is a better 'off the shelf' solution for integration, I don't want to use HAI components for everything. I don't know how well HAI supports the use of non-HAI components, e.g. Aprilaire thermostats, but I'm well aware of how well (or not well) that the M1 integrates with other components.
2. I'm choking on all the HAI 'press release' fluff. It really reflects negatively on the company. My parents were both in advertising and marketing, and taught me to loathe commercials.
3. Proven flood sensor and main water shutoff valve integration with the M1 - one of my primary reasons for alarm replacement. I'm sure it can be done with the HAI, but readily accomplished with the M1, using the Elk-branded water shutoff valve and GRI water sensors.
4. HAI outsells Elk, and I'm a proponent of the 'little guy' when it comes to business.
I haven't made my purchase yet, I am still aways off - Basement floor just got poured on Friday. I think you made a sound decision. In my opinion it comes down to who makes the items that are important to you. For example, I really wanted to do an M1G - but it is important to me to turn on and off bathroom fans based on humidity levels. Therefore, I plan on getting an HAI.
Winland makes adjustable trip point Humidity sensors with dry contacts that could be used to trigger a zone on the M1 to turn a fan on if you wanted. I am sure there are other ways as well.