I have to say I'm a bit surprised about the choice of RealNav when most users are already paying for a Navigraph subscription.
For 40$ you only get a quarterly update which for VATSIM/IVAO users could be "OK" but might leave you for 3 month with an out-of-date procedure which is annoying when you are paying to get just that... up-to-date procedures... (granted you might as well use your other airplanes ijn the mean time while RealNav pushes the update)
Essentially it increases the overall price of your addon by a fair bit.. unless you are targeting the professional market?