I've been thinking about the max range specified by Hubsan for the Zino, and the tests that people have done. What is surprising is that (the ones I've seen) the range seems to be as quoted at 1000m. Some even speculated this was geofenced.
Anyway as I had a few minutes to spare, I thought I'd check out the specsheet for the Atheros AR1021x used in both the Controller and quad. The receive sensitivity is quoted (at 5.8Ghz/6Mhz rate) as typically -90dBm.
We also know that the power output has been measured at typically 12dBm, and the antenna provide 2.9dBi gain.
Throw all those together, and knowing the free space path loss at 5.8Ghz (107.72dB/Km), we can calculate the typical range.
And guess what we get?
1100m

No coincidence there then.