[Kusuri]

- KoReader (better reading experience, more supported file formats, more customization)

- being able to install apps (drawing app for quick sketches, notepad app for notes, etc etc etc.. there are a lot of cool and helpful apps, Audio Player, Screensavers, File Explorer, Games, Terminal App kterm)

- being able to block auto updates to gain full control over your device so amazon can't do stuff you don't like

- being able to write / code your own software (python & shell scripts) for the kindle you then can run in KUAL to enhance the abilitys of the kindle self

short? it just gives you full control over your kindle so you can (for the most part) do what you want with the kindle without amazon saying "nah". it's like administrator account on a computer.. it just helps you to do what you want to do. but this only makes sense, if you really want to do anything already. if all you want to do is read books, you don't "need" it. it helps since KoReader is better for reading, but other than that.. you don't "need" a jailbreak.


Example:

I use my Kindle after waking up to write down my dream diary in the notepad app. sometimes when i want to show someone quick something by drawing something, i use the drawing app and even can make screenshots to import it later on my laptop. if i have read a book, i can delete the bookfile and empty folder+sdr with the File Explorer app. and if i want to shut down my kindle completly (not just standby mode), i can use a KUAL extension i have written myself which shutdowns my kindle completly. and when i'm bored, i can play text adventure games in gargoyle which supports many old text adventure file formats. and if i want, i can even read epubs in KoReader and modify a lot of things i can't in the normal reader app of kindles. i even can listen to mp3 files over bluetooth headphones if i want to.

it's really nice to be able to have full control over your own device and to do stuff you never would be able to without a jailbreak.