Considering the cheapest we see most airline currencies sold for is over 1.7 cents / mile this is a remarkably good deal. (travelingformiles.com)
Starpoints transfer over to American Airlines AAdvantage at a ratio of 1:1 (like they do for the majority of airline currencies) and, as always, the best value is to be had by transferring Starpoints over in... (travelingformiles.com)
If you have no apparent, immediate need for the AAdvantage Miles — Starpoints can be converted into a lot of other airline currencies so it's a more useful holding currency than AAdvantage miles. (travelingformiles.com)