It is not an idea, DJI even officially says this (and recommends not putting the inspire into travel mode on surfaces that absorb sound rather than reflect it, as ultrasound is used for this procedure).
I am in Europe and own a T601 apparently. (It says so on the sticker)
I have not noticed any range issues even with partially obstructed line of sight, or at distances over 1 km. But I don't fly that far out often anyway.
I had to exchange my brand new Inspire 1 without having flown a single time due to faulty ESC ("ESC status error"). The new one does not have this problem.