My take and experience on Nano..
I have both regular and Nano on 13 and 11 inch M4 iPad.
I use this on my 13 inch screen:
The papernano screen protector has been comprehensively upgraded with micro and nano flexible particles, so that you have a naked screen experience. Proper damping, no slippage, precise strokes, all within our grasp, no different from the creation on sketch paper, making painting and writing bett...
www.amazon.com
and TBH, it looks almost identical to the Nano on my 11 inch.
Here's why I think I won't go Nano in the future and why.
Resell value.
Some people HATE the Nano screen, takes away from the colors, etc..
This little $9 screen protector gives you the Nano texture and allows you to just remove it if you hate it.
Just something to think about when purchasing.
Save the $100 and just get the PaperNano, or try it..
It's $9, see what you think.