RC UFOs are a relatively new creation and addition to the world of radio control flying, and they can be flown by anyone regardless of whether you have rc experience or not.
Although not always flying saucer shaped, they typically have a circular airframe with between one and four independent electric motors that power their own horizontally placed propellers.
The more advanced rc UFOs, such as the Silverlit X-UFO also have electronic gyro systems similar to those found on radio control helicopters, to improve flight stability.
The Silverlit X-UFO is actually about the largest UFO currently available and has proven to be very popular with anyone looking for an alternative style of rc aircraft.
The Silverlit can be seen below:

This particular rc UFO has won a technology award for RTF model aircraft, thanks to its innovative design.
It can be flown outdoors (on calm days) from up to 300 feet away using a 4 channel rc transmitter to control the on-board miniature electronic management system.
Flying the Silverlit indoors isn't a problem either; if the UFO comes into contact with a wall then it gently bounces off and your flight continues uninterrupted. And just like a 4 channel radio control helicopter, rc UFOs like the Silverlit can be flown with incredible accuracy once you've got the basic handling mastered.
A stable rc UFO like the Silverlit will happily carry a miniature wireless video camera too, which are becoming increasingly more available from hobby stores for aerial photography fun.
There are a number of small, and cheaper, rc UFOs currently available alongside the Silverlit. These are typically made from lightweight polystyrene foam in the shape of a multi-bladed fan, and have a single electric motor that powers a horizontally mounted propeller situated in the central underside of the body.
A single channel pistol-grip style transmitter is used to control the altitude of the UFO through motor speed control. These little toys are a great deal of fun, for something so simple!

An rc UFO is a great product for anyone who wants a different kind of radio control aircraft, particularly one that can be flown around the home, without the complications of learning to fly an electric helicopter.
Outside, on calmer days, the cheaper foam UFOs can be great fun for almost any age and, while not completely indestructible, are tough enough to stand up to most kinds of treatment!
The Silverlit rc UFO is available from RC Discounts, along with smaller UFOs and blimps.
RC blimps - lighter-than-air craft for indoor fun.