I’m going with the Dronetag BS unit for my smaller models that are above 250g and the Spektrum SkyID unit for my larger models. The introductory price for the SkyID unit (69.99)mis only 20 bucks more that the stand-alone Spektrum GPS telemetry module, which I have been wanting to get, anyway. The SkyID can also send you GPS data while it functions as an RID, if you are a Spektrum telemetry user.
With the two mentioned above, plus the FT unit there are only about two other units on the approved list that are sort of in the suitability zone for RC aircraft: the as of yet unseen Futaba unit and the Blue