That was an interesting read! It appears to be a competent system but it's age may present problems when requiring additional receivers - as it seems to be the case. Do you want to invest more money in ppm systems?
Take a look at the SkyFly i6-X, a very good 10 channel system that supports a full selection of different SkyFly receivers to suit all needs. The best bit is that is can be purchased for under 50€ and is set to be around and supported for some years. You can find them on EBay and from Banggood.com (cheaper). Take a look.
Do l still have my old Futaba FF3. I don't use it now but l wouldn't sell it!
