I remember someone mentioning it DL's your HD;
True / False?
I don't know about that, but people are very suspicious of it and it definitely seems to install some sort of spyware onto peoples' computers, I'm just playing it safe and sticking with Windows 7.
If you did want to install it, I'd suggest doing a FULL backup of EVERY (primary) partition on your computer.
This way, you whould be able to restore it, but store it on a separate hard drive.