The 0.9 mm size works best for me

This was super cute and just the right size

I prefer the 0.7mm size because the leads don't break quite as often.

I like the size of the eraser and that it can be changed easily.

and YES I am using the right size lead

Half millimeter is the best lead size for all-round writing for adults

The key feature - a generously-sized eraser that you could twist to keep a useful length above the top of the pencil - performed only too well: without even touching the eraser, I could do nothing to stop it from extending further and further from the top of the pencil each time I clicked to advance the lead

I love this pencil and I wanted to try the size 9 lead.

The .9 size makes it perfect.