" If it ain't broke, don't fix it "
Words of wisdom.^^^ There is beauty in configuration control and
having a fleet with matching and working hardware
Unless you are looking for new features, there is no point in changing.
FYI, the Bavarian Demon 3SX has a horizon mode that holds the machine completely level, but is not GPS lock.
If you need something with GPS lock, look into something like the DJI Wookong-H Autopilot or Naza-H. They will hold a heli on a point in space like it is nailed. Yes, not cheap, but then this have never been a cheap hobby.
Team Minicopter - PeakAircraft.com
bavarianDEMON- Team Kontronik - Scorpion Motors-