I had to send my laptop for repair a couple of weeks ago because it just randomly decided not to turn on and since there was no way for me to get my data backed up before hand (you know, with the "not turning on" bit), I had no choice but to give my trust to the Apple team and let them repair my computer. I have to admit, I was a tad bit worried, but once it came back fixed and working, I took it home and saw that everything was still in tact, nothing out of place from the last time it was on, my worries faded away. You have to remember they're there to fix your computer. I highly doubt they care about other people's data - they're not going to gain anything from it. Besides, I don't have anything "crucial" on my laptop that I wouldn't want anyone to see - like credit card numbers, etc. It's not like they have a vendetta against you where they just want to see what you're hiding. They're just going to fix it, test it, and be on their way. I'm pretty sure people have better things to do with their time than to snoop in other people's computers. Which I will restate my previous point, I highly doubt they care because they're no going to gain anything from it.