The big thing about RANT that distinguishes it from all other packages is it is programmed to simulate ADF dip. (MS flight sim does not do it, I'm not sure if elite does)
If you don't know what dip is you will by the end of the IR and you will thank your stars you bought RANT. Remember the final test with Mr CAA examiner costs £10/per minute. Don't mess it up for the sake of £80.