I have one PIR/Microwave that have not installed yet. What I like about them is that they cover a large area, and most let you calibrate the microwave range sensitiviy.
I like the SureAction Pulsors for floors, stairs and beds (automation), but I think that they dont cover a large area, so burglar must step on the area of sensitivity (a a few feet from the sensors) in order to detect.
Gizzmo - Have you used the Pulsors in attic space? I wonder if the temperature variations could cause bending of the joist pillars and thus, cause a false allarm.