I have revisited Diamine Eclipse and got a new bottle, and I have some things to add.
I wrote before that I found it wet and lubricating. Uhh… Now I'm not sure. The fresh bottle that I just got isn't like that. I already gave away what was left of the previous bottle, so I can't compare them side-by-side. I'm not sure if it has changed, or if I just never did properly analyze what I had before. I never used it really heavily.
This fresh bottle of Eclipse is on the dry side, and in particular it's really excellent at not bleeding through cheap paper. I did some testing on a Dollar General writing tablet, and Eclipse outperformed almost every other ink in terms of not bleeding through. (The only ones that matched it were pigment-based.) It even outperformed a couple of iron gall based inks, such as Montblanc Midnight Blue and R&K Salix. But Eclipse isn't IG; it's a non-permanent ink that should be quite low-maintenance.
When it comes to the subject of "love/hate Diamine Eclipse", I'm coming down on the love side. I've been looking for something just like this. I can put it in my vintage pens, I can put it into pens with rubber sacs, leave them inked without worry, and still be able to write on both sides of copy paper, write on both sides of my journal pages, etc. My vintage Sheaffers tend to be wet and super-smooth, which means they love a dry ink like this.