Doing some random searching today, and saw that Vistana has added a 1-in-N block:
Edited to add: it looks like it is per-resort, not group. So, if you've stayed at 0450, you can still stay at V450, and vice versa, unless they just haven't programmed the block for V450 yet.
1 in 4 year rule effective 9/1/12 for both 0450 and V450.
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