The trade up program is not available for the 12's, you have to go up to the 1.6's. BUT, there is a 60 day(I think) window were you can return them for a full refund.
Buy the MMG's save for a couple of months and then if you want to upgrade just send the MMG's back.
Buy the MMG's save for a couple of months and then if you want to upgrade just send the MMG's back.