I have ADSL broadband from BT and get downloads in the order of 6 MBps. However, I am one of the first houses in Whitehall village and other folk get far worse speeds. The big drawback is BT's dreadful support system, their operatives have often promised that an engineer will be at my door by 8am next day; it is useless to explain that we are on an island and that the ferry will not arrive until at least 9am.
A number of households (including the island's school) have opted for satellite-based broadband and get downloads of 17 MBps or more. There is a plan to replace one of the two undersea cables that supply the island with mains electricity and our MSP is trying to get BT to liaise with the electricity board and lay a fibre-optic cable along with the electricity cable.
If you want a flavour of life on my island (I've lived here since 2004) read
The Limpet, Stronsay's monthly newsletter