We did do our own test. Due to the size of the room, we can only test up to 25 feet, and it is snowing outside, so I am going to test 60 feet tomorrow. Our test shows that the omega works all fine. It did occasionally drop a bit, but I didn't spot that huge fluctuation in around one hour. For each distance, we tested for 5 minutes, and recorded the general fluctuation range, most common number, highest and lowest number appeared. The measurement of distance is not precise, the actual distance is definitely greater than the table shows.
Here is the test result:
omega wifi signal test.xls