Hilton would be my guess for EASE of wiping them - YES you get a terrible rate, but YES, they are all in one place to be used WHERE you need them. And minimum amounts per program transfer might be the hassle too?
On the bright side, if you go to my thread on "The Buzz", you and your partner can end up with 6,000 Hilton miles in 5 minutes, totally free, or enought for a FREE Hilton night, so that might make up for getting screwed on the "exchange" rate!
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~ Glen ~