I asked another bookbinder/friend if she used these needles and she loves working with a rounded needle. I have only used the needle for a coptic stitch journal, I don't even know if it is a needle I would use with any other stitch.
Now, as I've mentioned, I have MS. My hands have taken a toll, so when I'm using them for too long (whatever that means on any given day) they want to curl up. There are stretches the physiotherapist mentioned but I don't feel they work. Having said that, I still do them.
I found the round needle to be great for the two coptic stitch books I've bound with it. However, I found it hard to hold without it turning around when between my fingers. As the sewing went on, it became more difficult, but that was because of my hands, not the needle itself.
I now see that when I took this photograph, one of the cover loops was loose. Luckily I did spot this post photo but pre completion of the book. *phew*
I found the needle allowed super easy kettle stitches (looping around stitch in previous signature), a nice in and out, and I found that the needle went smoothly between the signatures and I didn't catch any pages with the needle (big huge annoying pet peeve)