Hi everybody,i wanted to see if anyone here has used the DCC Specialties Block Watcher for Signals or Crossings and such.I'am planning on Purchasing a few and try out to see just what can be done with them before i buy what i really need.Any insight as to how they work do's and don'ts and pro's and con's .Would be great to hear what other people have used them for and how they hold up. Harold