Don't know a great deal about them but we used one to keep money in just for the sake of showing we had a deposit, we only set ours for 1mth as weren't interested in the interest rate for now.

We stayed with our bank also which made it easier if needed to transfer money out.

Checked today and if we need to access some of the money BEFORE it matures we loose a portion of the interest but don't loose anything off our original balance.
Also if you do access the account you need to decide then and there what you do with the remaining amount, ie. transfer to another account or submit that again for the term deposit over a certain period.

HTH, probably not what your looking for but a lot of bank websites have details about their Term Deposits and rates of interest if you want an idea.