I agree that of the “really cheap” boxes, Skyecho2, in the SIL=1 configuration, is the least incompatible, presently and future. However, anybody with a “nice” plane and who flies a lot, is much better served with an active TAS like this but a modern version with ADS-B IN. It won’t see SIL=0 ADS-B emitters (and according to “Mr Flarm” it won’t see any uncertified emitters) but it will give you...