I have FTTP and I am on Halo 1 with download speed of 75Mbps; this speed is quite adequate for my purposes. Why should I bother "upgrading" to Full Fibre 100 and take on a 24 month contract?
If you don't require the extra speed there seems little point upgrading, unless you can get 100 Mbps for the price of 75Mbps. However you maybe subject to a 24 m contract.