I shall read the other postings listed just now, but I wish to ask my question regardless: I would like to have some concrete information related to the why or not, to use either wi-fi only devices on my controller or spend more for a cellular version? I have seen comments, videos etc. of the devices (don't want to muddy the waters by stating brands) but it seems that to have full functionality one needs to have the full cell models connected. I understand a little about the range limitations of wi-fi and perhaps some interference, but I have not yet read any real data or solid info about differences between the two types. Anyone may answer, (please no rude comments) because I am ready to start fling my new Mavic Pro and wish to be satisfied that I am on solid footing. Cheers to all; Roger D.