Detech Fire Detectors

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Does anyone have any experience with, or knowledge of the mechanical
fire detectors offered by Detech?

I recently had an in-home demo by one of their salesmen.  The products
sound similar to what is offered by Masterguard: wind up, with a
fusible link.  They recommend putting these in areas of the home where
smoke detectors are not recommended, ie kitchen, garage, attic.

It also seems rather expensive.  They want $1500 for 3 heat detectors
and 3 or 4 ionization/photoelectric detectors.

Any opinions would be appreciated.

Matt