Originally Posted by iflyjetz

^ Correct. Points only can't use DSU. I think you can use the 6K point/night upgrade to a suite with a points only stay but I've never used points for a suite upgrade.

And since points only doesn't count for stay credits, I try to only book P+C or paid stays since I tend to just barely hit the Diamond minimums of 25 stays/yr (all stays are paid for out of my pocket, no stays paid for by my employer).