I just downloaded Aurora, but I hear that using it along with another version could damage my profile?

I have a desktop computer and a laptop. I have installed Firefox 4 on both, but today I decided to install Aurora on the desktop computer and I plan on installing Nightly on my laptop. My plan is to use the newer versions as my default browsers and resort to Firefox 4 if a site isn't working. I have Sync set up to sync everything across the two computers.
I have read on multiple websites that since each version uses the same profile, very bad things could happen to that profile if you use different versions on the same machine.
Is this true for my situation? Would my bookmarks or passwords or anything be lost or damaged? Will Sync sync my information to all of the different versions?
For example, is it ok to run Nightly on my laptop and Aurora on my desktop and use Firefox 4 when needed and have Sync sync my passwords and other information?
I hope this makes sense. Thank you for your help!

Thank you cor-el for those links! I have decided that I do not want to run Nightly anymore after reading that it could destroy my profile information or crash my computer.
Honestly, do you think Aurora will cause any damage to my profile if I use it with my day-to-day profile that contains all of my important information? Keep in mind I would be using Aurora on both computers that are set up to synchronize and then using Firefox 4 if ever needed. I've been running the betas for Firefox 4 and also using 3.6 when needed with my normal profile and there was never any corruption, so why would that happen with Aurora? Wouldn't Mozilla warn us? I do not want to set Aurora up to use a different profile. If that is dangerous, I will uninstall it and just use betas and final releases across my machines. But I would love to test the newest features and provide suggestions for improvement, but I need to use my same profile.
What do you suggest I do?
Thank you!

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== Description
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