Your first comment probably answered the second. You don't replace them until you know you have a design that withstands Boston weather.interesting. surprised i missed that.
but more to the point: 1) so in addition to being somewhat gimmicky, these things are not sturdy enough to withstand boston weather; 2) a couple of MONTHS ago and they haven't been replaced/reinstalled by now?
Bigger question -- why are the other ones still up there. Given inadequate design, aren't they a huge liability risk?