Lavan, I saw a Ciener unit some time back. As I recall, and someone please correct me if I am in error, the unit I saw was your basic replacement slide/barrel/magazine but minus any sort of external safety. I don't know if this was an early production or prototype unit or if it just doesn't have a safety... I lost interest real fast. I hear they sell new for around $250 but the magazines are a bit pricey.
The Beretta unit is rumored to incorporate the FS decocker/safety system, a major plus. Sadly, the unit is rumored to retail for $350 and is currently unavailable. When they do become available I may reconsider the topic and add this factory conversion kit to my Beretta collection.
Most have found that when all is said and done, a Browning Buckmark or Ruger MKII makes a great deal more sense. I'm a Beretta fanatic and that's the route I took...
Darryl
------------------
"In an age of universal deceit, telling the truth is a revolutionary act." -- George Orwell