And 2 months later...
We have a deliberant AP installed and it's working.
Just had to work through 2 cordless phones that were on the same channel, one unfiltered phone line, damn DSL modem that didn't want to talk nice.
I have to say that the deliberant device simply sat and waited and worked. It was easy to modify things to work around other devices that couldn't be changed.
If you have no clue, just make sure that you don't have someone holding it where you think you will mount it, and touching the grounding screw.