I can't say enough good things about this pen. I had looked a long time for a consistent, opaque, white gel pen that I could use to do journaling and accents on my pages. I think I've tried every brand out there (Sakura, Ranger, etc). All of them fell way short of what I wanted it to do - they were either too faint, clogged up, etc. But this pen is consistently smooth, beautifully opaque and well worth its money!
My only negative comment is that they seem to run-out too soon - which I'm sure is mostly due to my over-use!