The manuals get continuously improvement.
Also there are some chapters that have only a headline or a chapter name.
But the main parts a very complete and well maintained.
Go through it and decide on your own.
I work with the pdf files on my iPad.
But you are right, a printed manual is more convenient.
And the paper version is more authentic.
The main manual is still wip.
nevertheless, the User guide (that we extract out of the main manual) is almost complete.
We will continue working on the main manual and more and more we'll extract certain parts into a own individual document, that we than will release for print.
Will there be a tag like Revision 1 or so, for the first complete edition?
There is a deadline for the Userguide (the one with about 270 pages) around end of October. It will be printed as a book and will be delivered with the MEGA65. This book can't be changed anymore, it is paperware.
But the books as PDF will be updated nearly everyday at the moment. Or you can say: They will be never something like "finished". 
In every PDF you can find the "date of compiling" at one of the first pages, so you can see how old or new your version is.
exactly like Snoopy said.
The User Guide that will be shipped soon with the MEGA65 will be completed in a printed version.
Nevertheless, the Main manual will be reworked.
Our future plan is a similar approach like we are doing atm with the User Guide.
Part by part we will extract parts of the main manual and will put those in individual print versions.
Once we have them as a print version they will receive an ISBN number (like the User Guide already has) and then they will be counted as official or Revision 1.
