My BT HH6 arrived last Monday. Its installed on its own SMPS rather than the iFi iPower (for the time being anyway)
Its working perfectly, no obvious changes between it & the HH5 in performance in 'normal' use, however it does have an extended signal range, in the garage which was a blind spot & goes further into the garden area.
It has a more 'idiot proof' Hub Manager with less bits to fiddle with & less radio channels to select (if you choose not to use the BT 'Smart' auto channel feature). So whilst its got less programmable features to fiddle, as a consumer unit it does work well straight out of the box with its 'Smart' features,
I've split 2.4 & 5GHz bands, this is an easy to do on/off feature with the Hub Manager & it even renames the 5GHz band SSID automatically by adding '-5'. I have the 2.4GHz channel on 'Smart' but fixed a channel on 5GHz. Also turned off 'Smart Setup' which is a nuisance once the initial set up is done.
I've reset all my equipment including the audio from 'Static' (always use this IP address) to normal DHCP, the HH6 does not switch around IP addresses & keeps previously used addresses providing they are within the BT license numbers group. This better facilitates IPv6 I believe, plus its letting the hub do all the brainwork.
I'm waiting to see if the 5GHz line speed drops off as it did quite frequently with HH5 (a hub restart fixed this) As expected line speed remains the same as it did with HH5 - its a 80/20 service & I get around 74/18. Also waiting to see how often BT change the remote server which they did every 7 to 10 days before.