Some thoughts ...
This is a very unique deposit product that is a mixture of been a regular saver product and a term deposit product. It would only suit those that can save for the next year, then want to stop saving into the account and leave the money for 5 years.
6 years is a long period of time. The interest penalties are significant on this account. Hence, you are best only considering this if you are pretty sure that you will not need the money for the next 6 years.
You take on upward interest rate risk by fixing at such a low rate for 6 years. Conversely, the low rate is one of the better rates currently available for that time horizon.