The original JUMP plan could be a pretty good deal depending on how often you wanted to upgrade, but the new plan is... eh. If you're upgrading once a year on the dot it amounts to paying a little extra for the convenience of not needing to sell your phone. But if you're upgrading every six months, you're probably better off doing what you're doing.
JUMP only pays off up to half of your device cost when you trade it in. Right now the Note 4 (about six months old) is selling for ~$450 minimum on Swappa. JUMP would pay you up to $375 (half the retail cost) when you traded in the phone. So you'd be losing $75, plus the $60 you would have paid for JUMP over the last six months.