My brown RM's have never set off the alarm in ADL or MEL.
And come to think of neither have an old pair of black Aviator boots made by Rivers, but I don't think they make them anymore.
My genuine fake Breitling though did on one day set off the alarm the next day it didn't. And there wasn't even a drop dead stunningly good looking girl manning security!!!!!!!
Go figure
Go the RM's, they're Aussie made and tough.