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Although, bad is not really a word I would use, lets put this into prospective. There are certain vulnerabilities to one way wireless, but with all security systems the total risk should be considered. If your property is likely to be of interest to professional burglars then this type of system would not be suitable. But I suspect if you had this sort of risk you would not be DIYing and certainly would not be asking questions about security on a public forum. Assuming that you just want to deter the local druggies/opportunist that would not have the first clue about security systems or their vulnerabilities then the powermax would be suitable.