To understand the perils of the UY consider the following example:
Points 150 - UY Oct
You make a ressie for Sept 15-22, 2006 using 300 points - 150 from 2005 and 150 borrowed from 2006.
On Sept 1, 2006 you have to cancel the ressie for a family emergency.
Under the
DVC rules, you must use those 300 points b/4 Sept 30, 2006 or they are lost forever...ouch !!!
If instead you had a Sept UY, then the 300 points (150 banked from 2005 and 150 current UY) would have to be used b/4 August 30, 2007 which would give you an additional 11+ months to use the points.
So...does UY matter ?? In most cases...NO...but I don't ever want to be looking at my points expiring in 2 weeks with no possibility of using them.