I had no problems with iPhoto 11 but historically iPhoto upgrades have been hit or miss for some so it doesn't really surprise me. Hopefully people will learn t

I had no problems with iPhoto 11 but historically iPhoto upgrades have been hit or miss for some so it doesn't really surprise me. Hopefully people will learn to backup someday. You just can't trust any software with your data. I'm not sure Apple is any better or worse at this than others but you might as well assume they do zero testing and your data is just a big joke to them. If everything works you're pleasantly surprised. If it catches on fire you have nothing to worry about.