While staying at the Marriott Desert Ridge last May, took a drive there to see what it was like. The unit, complex, pool all looked quite nice. But I definitely got the feeling I was out in the middle of nowhere. This is in an area of Peoria that started getting some growth, new housing, new strip centers, new...
But now with the change in the housing market it looks to me like it will be many years before this area builds up.
It is fairly close to Sun City or Surprize AZ, so if your visiting folks there it may be convenient.
IMHO with all the nice timeshares in Scottsdale, staying there wouldn't be my choice.
Mike