Originally Posted by
warpdryv
No, everyone would get access to the YUL Transborder (Canada to USA) MLL lounge which you would already have access to as a J passenger.
First of all the OP said he booked the lowest Economy redemption, so not a J passenger.
Second, OP said they are flying to OPO so why would they get/need access to the YUL Transborder MLL lounge?
Sounds like Status Pass is the best way to go for them.