$30 (score: 7/10)
ClearView is available as a free evaluation download to allow you to evaluate performance on your own computer, and to check that your controller and/or Tx cable can work with it before buying. After the evaluation period expires, the software is disabled, but can be fully enabled by paying the $30 registration fee.
Although perhaps not quite as realistic as the "high-end" simulators it is much better than FMS and represents excellent value for money. It also offers a wide range of add-on models and scenery, and it can import scenery and models for several other formats. ClearView has an excellent reputation for responsive support.
Futher information available from www.rcflightsim.com.