Does it or will it work and why do you think so?

Http://www.americanantigravity.com/jetfan.html

"The JetFan UFO works on the principle of the Coanda-Effect, which is the operating principle behind most aerodynamic devices. The UFO is unique, however, in that it utilizes JetFan's expertise with high-pressure airflows to get the air to 'stick' to the outside of the UFO's body.
Because JetFan has been successful in keeping a high-speed boundary layer over the top of the UFO's skin, the result is that the entire device remains surrounded by a sheet of rapidly moving air, which creates a vacuum and generates upward thrust much like a normal wing."