Out of interest how are you guys finding the speed/range?
Sorry to hear its not performing as well as you'd hoped. Are you in a particularly congested area? The controller software has a neat feature that shows you all the other APs in the area fighting for the airwaves. I forget where exactly but its got a cool label in the UI like 'Rogue networks' or something.
I've got two examples in different locations installed.
At home I have an AP-AC-LR that is in my loft and gives me enough range to be about 80m away at the bottom of the garden and still receive a good signal. That has a breeze block wall and the roof to go through to get there but is in a rural location so not much wifi congestion.
At work we have an AP-AC-Pro that will still give a usable signal four floors down and that is in a heavily congested area where a Virgin superhub and Draytek had failed previously.
What I can't comment on is speed though as my internet is so slow that maxing out my 8Mbit connection at home isn't exactly hard and I've not had reason to test at work.