Is there a good primer thread on this whole exchange thing that someone knows about, since it's not likely in the HGVC forum?
Edited to state: The below applies to deeded weeks. You can also use DeX with points. I'm not a points owner so I won't discuss using DeX with points.
I'll provide a basic overview (and look for other threads), but
@chemteach and
@cindyc could probably give you more info.
DRI assigns tier values to units (1-6 with 6 being the best/highest). I own a 2BR LO at Sedona Summit. Depending on the week I reserve it's either tier 4 (high) or tier 5 (peak) for the full 2BR. If I LO in "Peak" season, 1BR is tier 4 and studio is tier 3. I can then deposit in DeX and have 5 years to exchange.
Within DeX, you perform a search based on specific resort, area, and/or activity (beaches, ski weeks, etc). It's not so much about trade power. You see the available inventory (regardless of tier). If you want a tier 6 week at Poipu, then you book it and pay a tier upgrade fee.
So what would it cost me to exchange my Sedona Summit unit for 2 2BR P@P Ocean View (tier 5) weeks? Presuming I reserve a peak week (which I've been able to do the 3 times I've done it), I'll have a tier 4 and a tier 3:
SS MF: $955
Exchange fee: $298 ($149x2)
Tier upgrade fee: $675 ($225 for 1BR deposit; $450 for studio deposit)
Total: $1928 or $964/week!
2 2BR Garden View/partial ocean view (tier 4):
$1478 or $739 per week ($450 less for upgrade fees since it's a lower tier)
2 2BR Ocean Front (tier 6):
$2378 or $1189/week! ($450 more in total for tier upgrade).
I think there's the DeX guide posted in a sticky in the DRI Forum.
Edit: here's the link for deeded weeks:
https://cmsprod.diamondresorts.com/sites/default/files/destination-xchange-guide_6.pdf