"RMS18" white motion sensor... Any good?

[R W]

Hola...

Continuing to try and support the shed cause I picked up some D/W sensors
and some PIR motion sensors.  The friendly and courteous X10 folk deemed it
necessary to swap in RMS18 motion sensors. (I still got my 10 for 40 bucks
D/W's tho... Phew!)

I'm curious what the group opinion is on these RMS18 sensors- if I should
send them back before I bust the blister pack.

Any idea what other more well known model this PIR may compare to?  I had
read on a post from 12/2004 that it seemed the same as the  MS13a.

Any help would be appreciated.

-Doug