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I used the OWC disk-doubler to replace the optical drive in my MBP and love it. The only "gotcha" that I ran into was trying to install from the wrong OS X disk. Apparently MPB needs the version it came with or newer to function.

Great summary. Last year I did the same (MBP2010) and I outlined all the steps here:

http://forums.macrumors.com/showpost.php?p=10814085&post...

How is the battery life?

Seems unchanged for me (I added an SSD, so the existing 7200 RPM HD became a rarely-used media drive).

I see ~5.5 hours real-world use on a 15" MBP, and my development environment includes a virtualized XP install.

I saw some improvement. No hard data though.