Tivo repair vs buying new

I am looking to cut the cord soon with the Tivo Roamio and I have learned (from this site) that there is a 400 lifetime of machine programing plan.. I was wondering if any of you have a lifetime plan and have tried to extend the life of your Tivo unit by either repairing it yourself or sending it off?.. What was your experience and was it worth it or not?
Thanks
Mike