Some people like them, many people do not...
o AEI will be better than the simple Yale
---- Yale are distinctly a bit cheesy
o Do you really need wireless?
---- eliminate door contacts -- just use PIR
---- central set of PIR does not involve much wiring at all
---- twin smoke detectors (12V) similarly doesn't need much wiring
---- then single feed to the SAB module outside
Do fit a 7Ah battery over the weedy 1.2Ah things.
Do not tell insurers...
o If the alarm is not set it could invalidate the insurance
---- they may also want it installed to BS & maintained
o Not telling them just costs you a tiny 10-15ukp discount
---- if you forget to arm it, it fails, you still have insurance
You can get some simple ones with LCD display re ease of use.