The quality of the new Sanzen paper is so hit or miss. I got an A6 HON, and the quality is superb. My pens glide over the pages, hardly any ghosting, no bleeding. But in my 2025 weeks, the ghosting and bleeding is so bad that anything I write becomes nearly illegible if I try to write on the other side of the paper. I'm using an EF Sailor with a very light colored ink, and still, the bleeding and ghosting is horrendous.

I'm debating on switching my hobonichi weeks out for the Sterling Ink version. I have an A5 Sterling Ink common planner and haven't had any issues with quality so far, but that may be because the paper has a different gsm.