Does Lion Recovery tool to reinstall OS X delete all your files?

I don't know why Apple can't make this clear:  Does the reinstalling option in Recovery simply reinstall OS X over the old OS, or does it wipe the hard drive clean, including your media, documents iLife updates, etc? 
Because my login freezes with the beach ball of death nearly every time I boot up, I've been hoping a reinstall would fix it, but I saw no option or information at all for what exactly happens when you do a reinstall, and didn't want to chance losing my files and settings. 

I think that the installation via the Lion Recovery HD will work like a repair install--which, in the case of Lion, requires only running the Lion installer from within Lion, itself. I have done a repair install as an experiment, and, yes, there were no noticaeable changes in the original installation. Of course, if there had been an installation-related problem to fix, then the problem likely would have been fixed via the repair install.
I mentioned above that I am going to do an experimental Lion re-install. I will be using the Lion Recovery Disc Assistant. I started the process, at my first opportunity a short while ago, but canceled the installation because the predicted installation time was over 5 hours--using gigabit ethernet. I plan to start again at bedtime tonight.
FYI, the system I will be installing from is as follows. I created an ultra clean install of Lion on my internal drive using the Lion installer from an external drive. Thereafter, I installed all else "by hand." This process created a Lion Recovery HD on my internal. Then, I created a Lion Recovery Disk Assistant.
I will never use Time Machine. I think tha app can be too big a PIA especially with a laptop. In general, I don't like to lose as much control as Time Machine requires IMO. My general back up/recovery process/medium is cloning to and from a bootable external created with SuperDuper--which I update pretty frequently, in general, and backup with respect to data very frequently.
So, after creating the ultra clean install noted above and creating the Lion Recovery Disk Assistant, I cloned to my external to make make sure everything would likely reamain AOK with the Lion Recovery HD/Lion Recovery Disc Assistant over time, Then, I made sure that the Recovery Disk Assistant still apparently functioned properly after a cloning to my internal by starting up to it, etc.
And, that is the point from which I began the aborted reinstall of Lion using the Lion Recovery Disk Assistant mentioned above. And, of course, this is the system I intend to reinstall Lion on at bedtime.
Time will tell. If anyone wants to beat me to the punch, please feel free to jump right in. Hopefully, if you do so, then you will let me know what happens so I can cancel my experiment.  

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