Mine blew at about 3000 km. Since it was after the break in period, I'd been driving "assertively" and I thought maybe I'd been too impatient. I'm actually kinda glad to hear it's a defect, bad as it sounds. I've never had a wrx/turbo/new car before.
I'm about 1500km into the new engine, (~1000 miles!) and I'm doing my best to be gentle. So, a smart shopper might be wary - but me, I still love my rex. The dealership was decent about it. and one imagines Subaru has made efforts to fix the issue.
edit: back after checking: Manufactured 08/08, VIN ending 804451. Just like that nasioc thread says. *shakes fist*