Originally Posted by
MSPeconomist
To answer my own question a bit, recently I was looking at materials for the Reserve card. They stated clearly that it gives priority, after elite status level and fare class, for free elite upgrades but does not give any priority for instrument-supported (GUCs/RUCs/SWUs or miles) upgrades. YMMV.
Out of curiosity, where is this stated? I've been looking for a few years now to see if it is still a benefit and haven't been able to find anything.