I bought Nushield for my Cintiq 24HD because it was starting to get scratches, so I thought I'd write my review of the product in case anyone finds it useful.
First I bought the triple A film because they recommended it. When it arrived, it was folded badly and the thin layer that covers the glue side of the film had come out at many points because of it, so it was super dirty. I tried cleaning it as explained in the instructions, but it was no use. I had to throw it directly into the trash bin and contacted their customer service to get a refund.
They were very kind and offered to send me a replacement at no extra cost. This time they sent me the antiglare film, because that one only has glue around the borders, so it's easier to clean if the same thing happened as with the previous one.
Well, I got it today, and yes, it's easier to clean, but the fact there was a huge scratch on the film that obviously didn't come out when cleaning didn't help. It's not like I could install it anyway: the whole film was a bit too big for the screen, but I couldn't cut the remaining parts because... well, it only has glue around the edges, so if I cut off the edges, there's no glue left to keep the film in place (not that I was going to install it as scratched as it was, but).
To summarize: never in my life I'm going to buy a Nushield again. I wasted around 70 euros (counting the film and shipping) on something that I couldn't even try because it was deffective both times. I don't know how it is for smaller tablets, but for Cintiq 24HD it just doesn't work *sigh* At least their customer service is nice, but that's not enough to spend money on a product.