Funny, I just went back to a kneeboard a few months ago. I stopped using one when I started flying with a tablet 7 years ago. Tried multiple alternatives but ultimately decided that nothing was easier, more efficient, more stable, or more natural for me when needing to take a quick note in flight than writing with a pen or pencil on my leg without looking.
I'm using my basic ASA, which is probably 20 years old, but with a new strap. I wish Zuluworks still made the Mini-Z, or better yet, find a used one cheap, because I'd like something even smaller, although the standard steno pad size is fine and I really can't see spending much for what is essentially a $2 clipboard ($1 without the low profile clip) and a strap (yeah, the strap is optional but I like having it when things get bumpy).