Recontracting consideration, advice appreciation

This is my 3rd year on JET, I have received the recontracting letter.
I have a deadline to say if I want to or not but I'm not sure, nor have I been given an official recontracting form.
Is it bad to say yes now and then no when the recontracting form comes?
Will it effect the JETs offer for a free plane home? Pension? Etc?

Any advise would be appreciated

by hannahmaruss