I had the installation carried out in January and it was done within an hour but the engineer said that the fibre cable outside was down and someone else had to go back and check it. He said it should be on within 48 hours.

48 hours pass by and nothing. I eventually called them up and to their credit, they sent another engineer round who had turned on the cable outside.

Since then, I've had a pleasant experience so far. I have a 500 Mbps package and I get ~470 Mbps on WIFI. No downtime whatsoever which I couldn't say with BT. My only minor grudge is the Huawei modem that's been set up.