Honestly unbelievably bad. Literally left a hole in my wall during the installation, which created a mould problem. Phoned them and spoke to dozens of customer service reps over a one year period trying to get this sorted. I was constantly promised that they would send someone round to fix it and also compensate me, neither of which ever happened despite my follow ups. When the mould got so bad that I literally had to move out (of a home I'd lived in for nearly 4 years), and I explained this to the customer service rep, she suggested that I recommend virgin to a friend and get £50 credit?!?!?!? Also the wifi constantly cut out and they did nothing to fix this! Shout out to Lauren in the 'I'm moving house' team who was super lovely and competent!