Quite the dilemma. I have the FTTC service and was on the 40mbps option 2 when they offered the free upgrade to 80mbps. The reason I found out about it was that on that particular day my speed was very slow and I got a read back of 6mbps via speedtest.net and I went to the BT website to complain to somebody. I bit the bullet, re-signed for another 18 months, and my speed shot up within an hour or so to 74.6 down, 16.7 up. In general it has been better since the upgrade. but there is the odd day where things aren't so smooth. One day recently I was trying to download some archives from my company's US headquarters and noticed I was only getting 12mbps down. I confirmed this via speedtest.net and indeed I was getting 12 down, and 16.7 up!!! went to make myself a drink (to centre myself before the taxing call to BT) and when I came back 20 minutes later it was up to 36mbps down and a little later back to my normal 74.6. These occurrences didn't happen at all when Infinity was first installed, but then started creeping in on the original system. Since the upgrade there's still funny business, but much fewer and further between.