Just remember the DS10a's transmit their on off state only during a transition. They are great for non-security applications (we even have a thread on inventive uses for DS10a's here).
I just figured out how to get my Vera to pick up X10 RF signals a few weeks ago. I have mochad running on a pogoplug with a cm15a interface, and then I use a mochad plugin for the Vera I've been working on. The RF stuff seems pretty reliable if you modify the cm15a antenna for better range. I was planning on picking up more sensors when x10 had really good deals (20% and free shipping on all orders, etc).
I am quite happy with my z-wave switches and my dsc alarm system, but the X10 RF fills a need for cheap remotes and sensors and now works really well my my vera. Too bad the slimline wall switch did NOT pass the WAF test at my house
I'm very concerned that the supply of cheap X10 RF sensors and remotes is going to dry up! The ebay supply certainly has, and the X10 emails are really focusing on non-X10 products, including some that seem like direct x10 competitors (remote controlled appliance modules?) But I can't find anything other than the original CEPro article and a bunch of forum threads commenting on it. Has there been any more direct news that the factory is ceasing production?