[Analogus]

I've done a quick (uncomplete) comparison:

Installing/deinstalling:
I installed it over PRS+ which will be deinstalled. Reinstalling PRS+ was no problem. Installing the new firmware runs without problems. Deinstalling the firmware is simple (just deleting a folder). I presume, that part of the Sony-firmware will be altered similiar PRS+ does.

Booting; standby:
Very quick (far less time than the 'normal' firmware. Standby is still working.

Interface/look and feel:
Very simple and straight, man couild say a bit rough and outdated. There are no cover-pictures for books, just simple lists. Opening a book only is possible with the (very good) file explorer. That's not very user-firendly. No collections possible, no favorites. Book history available. That's a big back-step. Menus are reacting slow. Not too slow for working but noticeable slower than with PRS+.
No ability to asign buttons.

Edit: Opening menu-points partly just seems to be slow: There always is preselected one menu-point. Chosing that reqires ONE tap. Chosing another menu-point requires TWO taps with the finger. The first one for selecting, the second one for opening. Selected menue-points aren't very good recognizable. So if you tap just as usual one time to open a menu point, nothing will happen.

Reading software:
Completely different software for reading books. You have the possibility to choose your own fonts, size and margings within a book without reopening the book. Very good. But the reader software is slow! I'm not sure, but I have the suspision that CSS is not fully supported for eBooks (I missed italic style). So there are plus and minus. I regard the reader software too slow. Especially PDF-files are very slow. Zoom-levels for ePubs are better stepped and very usefull. Paging forward with one single tap possible, and of course with normal swiping.

Dictionaries:
You can load your own dic's very easy. With the firmware you have no access to the 12 sony dic's! Or did I miss something? Double-tap for dic's is still working. But you have to start it in one extra step before you can unse it for each book you open. After closing a book, you have to load it once more. No big issue.


File explorer:
Very usefull! Fully functional: copying, deleting and moving files and folders possible. Creating folders too. Big plus!

PDF-support:
Viewer has good zooming-modes. But far less useable than the original sony one.

File-support:
Very, very good: a huge amount of file-types are supported. But I didn't test them, so cannot say more about.

Screen-shot:
Yes; very simple to use

Bottom line:
Better than PRS+: file support; explorer; user dic's; font-scaling and chosing; quick-boot from off-status
Worse: interface/look and feel; velocity; built-in-dic's; PDF-viewer; no custom buttons;


I tested it for one or two hours and deleted it because for me there are more downsides than upsides.
Optimum would be to merge the features of PRS+ and this firmware.

A.