I switched from BT to Sky.
Other than the Q hub being crap, I've had no real issues. Same sync speed, pings are little lower than BT (not much, but a little lower). Sky run a transparent dns proxy on the Q hub now, so if you use custom dns, you'll have to get firmware rollback or use something else.
Not sure what hub you had from BT, but you can flash the hh5a with openwrt and then use on sky. It's a nice enough router when it's not crippled by BT's firmware.
Other than the Q hub being crap, I've had no real issues. Same sync speed, pings are little lower than BT (not much, but a little lower). Sky run a transparent dns proxy on the Q hub now, so if you use custom dns, you'll have to get firmware rollback or use something else.
Not sure what hub you had from BT, but you can flash the hh5a with openwrt and then use on sky. It's a nice enough router when it's not crippled by BT's firmware.