I can confirm that it is a little laggy, especially opening apps and switching between apps. I think most of it is down to the low amount of RAM, though I don't think the SoC is great.
Battery life is very mediocre on the 4G model. It is a small (replaceable!) battery though.
The display really struggles in bright sunlight.
But there are just no alternatives if you want a stylus, other than the Active 5.
Don't know how the Exnos CPU would hold up today but these were great tablets. SPen capable. 4GB RAM might be a bit anemic. 64 or 128?