The portable version is a complete version of the program. I switched to the portable version about 4 months ago. I love the convenience of being able to use it on any of my computers.
The only downside I've encountered is that it can be slower - writing to a usb drive (which calibre does frequently when editing metadata, adding books and so on) is slower. USB sticks vary so if you have a few around, try a portable install on them with a "sample library" and see how they compare.
Aside from this issue, it operates just like the regular desktop version.
As for pros:
Easily move between computers
Easy to update
Easy to backup (all files are in one folder)
Edited to add - forgot about the drive letter issue with additional libraries - see next post.
Last edited by CWatkinsNash; 02-14-2012 at 09:40 PM.
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