I did a quick look at the information in the link. I have a Tri Metric system in my FC 20'. Some quick impressions:
It probably is not as versatile as the Tri Metric in that it does not have all of the various possible readouts and settings the TM has. On the other hand, many will never use the capability of the TM, and sometimes the TM is kind of a pain to figure out and use.
The cost is considerably higher than the TM.
It most likely would be easier to install on a simple installation than the TM, but if you have two large negative cables as I have (one for the inverter, one for the coach) it might be more difficult to install.
The idle current of 10 mA, although not high would, over time, run the batteries down, so, it needs to be disconnected for long term storage. The TM also has that same problem, just one more reason I recommend total disconnection of the batteries when in storage. I think this one would be easier to forget, not sure.
If you are comfortable using your smart phone for everything, I guess that reading the battery capacity etc is ok, but I like a dedicated readout. I am old school, I admit.
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