We have 9 smoke detectors plus 2 heat detectors in the garage. (Finished attic and some extra doors isolating a room.) All hard wire interconnected. Since this will not interconnect with units from other brands, it doesn't even use the interconnect wire, it's an all or nothing proposition. Quite an expensive proposition.
Can't even get one for just near the kitchen, since a partial switch isn't a scenario they support.
And, since they don't have a heat detector for the garage, and can't interconnect with what's already there, can't switch and still pass code. Would make selling the house impossible.
Maybe version 2 will interconnect with other brands and open the market to more people. I know the $45 ones from Lowes interconnect with a few brands.