Leaving BT after being a customer since 2012. Put up with low FTTC speeds because of where we lived initially but been generally happy with support for the odd problem every few years. Regular calls to get speeds back to guaranteed was needed too often however. I've always found Openreach engineers knowledgeable and efficient. Only issue has been getting BT to agree to send one out to me before hours, sometimes days, of other tweaks and tests. Pleased to be upgraded to FTTP a few years ago though. No such problems since then but not so happy with the contract price which has crept up to around £50 now. Hoped for a lower price if I renewed (especially as I've now retired) but told that the cost will go up by "just" £3 next Spring and no better deals possible. Have bitten the bullet and ordered a new contract to start with an altnet next month. A bit nervous that FullFibre may not be as reliable a carrier as Openreach but as I'm almost halving my monthly cost I have to give it a go!