I installed the new Siren system this spring after reviewing all the similar priced competitors. Had a problem with the original unit that they immediately replaced. Unit has been flawless. There have been a few places were cellular service was spotty or nonexistent which obviously impaired the unit (as well as my phone).
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My one gripe about the unit (and their competitors) is the wire size. While the amperage draw is minuscule, working with 20 gauge or less wire is a big PIA. I ended up taking the wires I might possibly use from both harnesses, adding heat shrink ring connectors, and attaching them to terminal blocks. The center one in the below picture in the common negative buss.
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I also decided that I wasn't interested in the wireless sensors and did everything hard wired.
I have:
2 high water alarms
Shore power monitoring
12 VDC monitoring
Motion detection for intruders
Geofencing to alert me to boat theft.
And engine shutdown from my phone should someone steal my boat.
I may also add a temperature alarm for the refrigerator and freezer in the future.
With all the additional wire stuff and a few relays, I'm into it for less than $1K.
Ted