Quite a few folk experiencing very poor (or no!) performance with wifi from these. My son has recently gone over the PN from BT and now has had to re-instate his BT router to get any connection.
Problem well-known to PN but has been ongoing for 9 months or so with no resolution. Latest 'advice' is to switch off the 5GHz . Son did this and found the wifi connection with LOS fading at 10- 15ft - hence the return to the BT box.