I was implanted in April 2008 and switched on a month later (Nucleus Freedom). I asked my audiologist last week about upgrading to the new system and she said that I couldn't unless there was some terminal failure in my current speech processor (which rendered it beyond repair and was not my fault). She said that they (CI dept in Beaumont Hospital) owned my speech processor and that I could buy one myself and quoted me a price tag of 9000 euros but could not use my current one as a trade in.
That's the situation from an Irish perspective. I'm going to contact Cochlear UK tomoroow and query the price as I'm seriously considering buying it (as the surgical procedure and processor are not covered by health insurance in this country). The operation and initial speech processor are provided free by the CI Dept, as they are funded by the Irish government.