I haven’t had a lot of time for playing freerolls, but my
stats are below.  The times I got close,
I did exactly what I outlined in the Freeroll strategy blog.  Even if you only win that big stack 20% of
the time, that is every 5th free roll, which could be twice a day
depending on how many you are playing. 
If only half the time you go deep, you have a rather good shot at
winning some of that free money.
Update: So far, all the times that I went deep, I ended up
all in against another big stack, and the winner of that hand would be in the
top ten chip leaders.  Every time, I have
had the best hand, and have lost.  Sooner
or later I will win a couple of those key hands, and have a shot at the tournament.
    
    
I will continue to post updates as I play more tournaments...