Here's one take from my SO who read this thread but doesn't post:

Her choice is to use at least two of the rewards for points/miles. Her view is that a 30,000 mile reward is the same as two SWUs (when upgrading internationally and from PE). The 30,000 miles don't expire and you don't have the heartburn of throwing a fit when you lose one of your SWUs at the end of March. The flexibility of the 30,000 miles is key for her.