I had mine out the day the onc said it was OK. For me, it was like the formal end of treatment. Also--and this is just me--to keep it in was just a reminder of something that had happened. Also, and this is just me, I felt that keeping it in forced me to stay in "sick mode," and it gave my brain the impression that I was expecting the cancer to return. In the end, I couldn't think of a good reason to keep it whereas I could think of many good reasons to have it removed. If I ever have a recurrence and need it, I'll have another one inserted. Hope that helps.
Hugs & prayers,