500 m is probably a massive overestimate.
As such, 500m is only 1640 feet.
I really don't care about speed, I don't need much speed to chat, or to look up phone numbers, or to check my account balance.
Another key point that may be a part of that reviewers problem is that I will almost never use it while the office is open. I tend to chat at night.
That being the case, I won't be sharing bandwidth with anyone (or at least very few people).
for that price I'm inclined to give it a shot, I can always return it if it doesn't work. I wonder if the reviewer had anything remotely close to line of sight? I can actually hang my head out the window and see the rental office.
in a couple of months it will be dark all the time, so nobody is likely to notice my little antenna outside the window facing the rental office. I'm kind of intrigued!
Although, if it does work, I wonder how long it will be before enough people do it that the rental office gets wise.