There’s a high environmental cost of exchanging a perfectly functioning Mill that's actively keeping food out of landfills. The benefit of renting (or having a bin under warranty) is you'll be taken care of if any issues arise, which means you can be eligible for a 2nd generation Mill.
If you'd like to upgrade to a 2nd gen. for a fee, you can review our buyout program terms here and reach out to support@mill.com if you're interested.