I have had virtually no problems viewing either commercially purchased, or free library EPUBs on my PRS-650.
The file size limits you mentioned, are recommended by Adobe (who does the EPUB reader software for Sony), and since Adobe also does the ADEPT encryption for virtually all the mainstream book publishers and about 90% of the EPUB reader devices, nearly everyone goes by Adobe's recommended internal file size limits. If you purchased a book with a single 3mb file, the publisher is grossly incompetent and you should demand a refund.
The PRS-650 provides 3 (not 2) viewing modes for your main library (Kindle has only ONE), and to avoid the title truncation issue you mentioned you should simply switch to 'Title Only' which will wrap the title. The 'List View' and 'Thumbnail' views do truncate long titles, but that's because they need to fit things into a single line.
Even in list view, were Sony doesn't wrap the title (using the second line to display the author info) the title 'The Girl With the Dragon Tattoo' fits just fine, so things aren't that bad.
If you thought the Sony's software was disorganized, you clearly haven't had a chance to use some of the other readers out there like the Nook and Kindle.
Compared to these others, the Sony PRS-x50 series software is much more logical and internally consistent.
For example, on the Sony, when you are on the home screen, and your book listing exceeds a single screen, a nice A-Z side index slider appears - and when you are viewing a long listing of notes you have made, or a long listing of collections, the SAME type of A-Z side index appears.
This A-Z slider not only makes navigation much simpler, but once you figure out how to navigate through one of these listings, you can then reuse that knowledge to quickly navigate ANY long listing on your Sony.
When you are on the Sony's main home screen you can view a global list of ALL the notes you have made while reading, but while reading a specific title, you will see notes related only to that title (context sensitive).
When accessing the dictionary from the main screen you can ALSO see a global listing of 'word lists' (words you have looked up previously while reading any book), but while reading a specific title, you will see that 'word lists' will now list ONLY the words you have looked up while reading that specific title (so it is context sensitive in EXACTLY THE SAME WAY as the note listings).
This internal consistency and simplicity, make the Sony's interface quick and easy to master.
By way of comparison, the Kindle's main library listing lacks the Sony's A-Z easy navigation controls, and what features that the Kindle does have are inconsistent and badly organized. (ALT-THIS, DIDDLE-THAT, YOU-CAN'T-GET-THERE-FROM-HERE MENUS)
- And the B&N Nooks aren't much better. The original Nook didn't even list your personally loaded books in the same listing or format as those purchased from B&N (the new Nook Color and Simple Touch are much better than the original Nook in this regard, but still nowhere near as simple to navigate as the Sony PRS-x50 series readers)
So, try the Kindle if you like, but be aware that it's interface is much, much, much less refined, logical, or consistent than the Sony (at least that's the opinion of myself, and about 90% of the people who have tried both).
As for the typos and other problems you found in Google books . . . I agree. - Sadly, Google seems to have put a higher emphasis on quantity, rather than quality - for nicely formatted free books in EPUB format, try the
public domain section of www.feedbooks.com