Anderton
The simplest option is at the end of the year, upgrade for another year.
That is what I think everyone is going to do. But even there one question is (from my knowledge) not answered: WHEN should be do this?
Let me explain. From what I know, the Membership starts from the date of payment. If someone has the membership at this time, it is no longer counted, so it is not possible to extend the membership now for the next year. So, if done "too early" that short the previous up front period. There is no reason to do this (for usual customers 150/256 per day... but still). So, should it be 00:00 at the next day, one day, one week after? Which penalties can be if someone forgot/had no money/made a decision to wait X months with the next up front payment?
Yes, all that make no big sense for most of us, but there should be clear answers on such questions.