I don't thing I've seen any z-wave ones specifically rated for outside either. Depending on your climate, people have used indoor sensors outside successfully in sheltered locations.Looking for an outdoor motion sensor to integrate with HomeSeer, preferably battery-operated. I can't seem to locate anything rated for outdoors.
It depends heavily on where the sensor is mounted. For example, an indoor single PIR motion sensor mounted on a covered porch pointed at the front door would probably be pretty reliable.I agree about dual-tech sensors... I have an outdoor Insteon single-tech (IR) motion detector and during the day it can be way too sensitive... i.e. glare from car windows passing by 50 feet away on super sunny days will register. It's decent at night, though. Dual tech should def. help with the day problem, but I don't rely on the sensor during the day, so I haven't found the energy to run a hard line out and replace it with a dual-tech sensor.
I haven't had any problems with my z-wave network having connectivity issues, though... but as with anything wireless, everyone's experience is going to be unique.