Yes, you'll always get different answers and results. This is due to the environment you're flying in. The same quad that has a range of 400 metres in an open field out in the country may only only get half the range in a park in the middle of the city due to magnetic and electrical interference
I have a hubsan advanced that I just bought and I can easily get 1000m consistently and once reached 1500m in a heavily residential area. I have a couple of line of sight gaps that I fly into to get it. I took it up and out at night and kept an eye on the lights to figure out the right altitude to make it over everything. Can't tell in the daytime.
I only have the standard. I've never gone past the 300 meter mark. I'm going to order a antenna set then try it. I know they are suppose to return if out of range, but I haven't brought myself to trust that yet. I really enjoy the H501S, but I'd like to move to the advanced at some point in time. Thanks BC Rich.