It's pointless........ annual upgrade just means you can hand back after year and they will clear the remaining finance....... which will be less than you could see it for yourself either on Facebook, ebay or the buyback sites. After 12 months you will get at least 50% of the original cost on resale.
It’s not pointless as this year you are still going to need to pay £700 upfront each year. Annual upgrades are a far better idea from a Financial point of view by not needing to pay out so much all in one go