I have no connection with Oddsoft, who produce the computer based R/T trainer and tester, but have been testing the software over a number of months (for testing read "doing all that I can to break the software"). Our R/T examiner has also been authorised to use it for testing for the FRTOL..
Compared to our previous R/T trainer and others that I have seen the computer based product is a quantum leap forward. It takes minimal time to learn how to use the simulator and it has a flip-flop "radio", "transponder" and a moving map display which makes the whole thing much more realistic.