Thanks for the link to the reviews. We found out from Specialized last year that indeed there have been problems with that crank. It had only dropped in gears 1 & 2 which are gears I seldom use and I don't think used in the first year of having the bike.
Keep in mind that the crank is from 2007 and they might have taken care of the problem by now.
I am fine with my none carbon Ultegra crank. I also purposely went on those hill repeats on Sunday to get over the fear of the chain dropping in those 2 low gears. I feel much better now 
~ JoAnn
2012 Specialized Amira S-Works
2012 Vita Elite
2011 Specialized Dolce Elite (raffle prize) - Riva Road 155
Ralaigh Tara Mtn Bike