I have recently moved from BT after their shambolic raising of prices mid contract for the third time in 18 months. It was a bit of a gamble trying Vodafone, but one that has paid off. Everything went smoothly, only 30 mins of outage on the day of change over.
My daughters were always complaining about the BT wifi, but the Vodafone router and wifi is so much better, stronger signal all over the house.
Speed is at the max, 40mbps and zero drop outs.
Long may this continue
**Update** A couple of months on and it has been working perfectly all that time. No complaints here.