@Willy Tärk
Thanks willy, the Sony DPT-S1 has been a blessing, I love it, I use it daily, and it's a great device, the majority of my documents are in pdf (math, algorithms, scientific papers), and I can't tell you how much this thing helps.
I'm sorry I didn't have the time to make a video yet, I will soon, it's been cloudy here in Geneva, and my apartment lights are just not prefect for filming, I'll work something out soon.
Now, 13.3" vs 9.7", for pdfs, comics (in pdf), web browsing, diagrams and illustrations
GO FOR THE 13.3", no question, seriously, everything is readable, it's like you are reading these materials the way they should be read, I can't describe in writing what huge difference it is, I'm not going back to the 9.7".
Keep in mind also that beside the size, the 13.3" Sony is much more a portable device for me than the 9.7" Onyx because of the weight and thickness, it's easier to handle and carry for longer time in one hand, the pen is amazing, it feels like writing on paper, it feels like nothing when it's in my backpack.
Basically get the 13.3", my advice is, get the Onyx Max if you want more from your reader than just reading pdfs and taking notes (oh, and musical sheets), the Onyx Max is going to be faster, the reader software is good and Booxter provide a great service based on a personal experience. Get the sony if you want paper like experience reading pdfs, I can't emphasise how much the weight, the thickness and the touch screen made a big difference to me, these are the reason I went for the Sony instead of Max.
One last interesting experience, when I slide across the screen to turn pages, I can feel the screen is not flat (just a feeling, I can't see it), I like it
, it feels like I'm really using something with texture not just a flat screen.