Extra Gallery

[mganko]

I would avoid it, this plugin is not mature enough and slightly buggy.

It does not create thumbnails automatically.. at least I can never get it to.
The names are case sensitive, and you cannot change the case once saved, very annoying when using a name or id argument in code.

I have never problems with that what you writing. Of course the name is case sensitive, I don't remember but it's the same in I18N Gallery. Thumbnails creates automatically if you only select that option in settings.