Got the PTY-MDE upgrade, ended up costing me $42 USD, the service wasn't amazing, no TVs, short flight. Some food was offered but it was kinda strange (I've already forgotten what it was) and to no fault of their own there was turbulence for most of the flight so 1 drink and the food was served in a rush late on.

That said...honestly for the $42 to beat the whole customs line on arrival in MDE which put me ahead of our whole flight and I believe the Jetblue flight was well worth it. I will definitely try this again on my next trip. Highly recommended for anyone who would like to try the CM J service or who would like to sit in J and maybe not pay full fare.