The two noticeable differences I can think of between 2.1.5 and 2.3.2 are the addition of series info support and displaying the chapter name in the pop-up when using the navigation bar.
There are two notable bugs added. The TOC doesn't keep track of the chapter as you read the book and if the margins on the device are not set to zero, reopening an epub will open a page or two earlier in the book.
If you are updating from 2.1.5, you should use the desktop app or WiFi to do the update to 2.3.1 and then sideload 2.3.2.
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