write beautifully but...
339954
These markers write beautifully. They are liquid and flowing, and make a full dark, easy to read mark on a whiteboard. But the ink does not last long.. in my experience only 2-3 weeks.
3785496
I own 3 of these pens. I LOVE how they write. I LOVE how they feel. I LOVE the inexpensive price.

HOWEVER... The Nemosine Singularity pen has a bad tendency to crack around the edges of the cap just below the steel ring. The cap will still screw on fine, but it looks raggedy.  Therefore the pen is destined to be made a desk pen where the looks do not matter.  If you plan to carry it - be aware - inspect it upon arrival. If you see light lines perpendicular to the steel ring leading to the edge of the cap - it will crack.  Or maybe you could buy a black pen so the cap cracking cannot be seen as readily.  My recommendation? Same price point for a Pilot Metropolitan with a much sturdier cap.

JC
2728037
I love how these pens write.  There is just something addicting about how smooth they are and the comfort of the barrel, even though they don't have the ubiquitous comfort grip.  I honesty go through withdrawal when I run out of these.  This particular set has fine point (0.8) and medium point (1.0).  I don't care for the fine, and they aren't offered only in medium, so I just donate the ones I don't want to the local middle school, where the kids are thrilled because they don't have the money for supplies like this.  There are drawbacks, though.  I love the black and dark grey ones but there are very few of these in this set compared to the others.  Second, the pens must be stored with the tips down or they may skip (if they do I just shake them out like I would an old-fashioned thermometer).  Third, there are a lot of pens that are so light they must be used on dark paper.  I just wish I could order the colors individually.
4648176
I love almost everything about these pens - they flow across paper smoothly (almost like you're writing on air), and the ink is very bold. The only draw back is, the pigment does bleed through, and spread on basic notebook paper (i.e. cheap notebook paper), and the tips aren't quite as fine as I wish they were. Still, they are a wonder to take notes with, as long as you use the right paper.
692258
I love these pens. I have 3, one with a black, one with a blue, and one with a red cartridge. They write really smoothly for the most part. However, I did have once cartridge (a black one) that didn't write as well as the others. I just threw that one out since I had an extra black one, and the extra one I had wrote much better. I'm not sure how common it is to have a bad one, but it happened. Maybe if I had kept using it for a while it would have improved, but I wasn't patient enough to try.
4597961
really REALLY Wanted to love these, but sadly they REALLY don't write well. Just too persnickety in how you hold them if you can find a sweet spot- can't put it down or adjust the grip.
3561173
Excellent research and products, but ridiculous writing.
Sometimes it just doesn't make sense. But usually the problem IS capitalizing THE least important words, NOT TO mention italics AND underline AND bold. I imagine online THEY use lots OF  **word** stuff too.
Even when it's the IMPORTANT WORDS that are emphasized, it's a PAIN IN THE NECK!

Oh well, it used to be much worse. Things just didn't compute, so to speak.

Hey Life extension, I'm a great copy editor. I work cheap part time, and I don't need benefits!
Contact me at lifext.review@harmless.fastmail.fm

Recommend.
888554
However, the pen itself writes (almost) flawlessly - not the best for glossy surfaces.
196996
I got these pens on the recommendation of other users on Amazon. They are wonderful to use, they don't bleed through the paper (I have the Enchanted Forest coloring book...this is my first foray into adult coloring books), and I love the colors and how they look on paper.

However, I wish for a few things (the reason I didn't give them five stars): I definitely need more shades of colors (more greens and browns, specifically, for what I'm doing), I wish the colors had "names" to help with identifying which one I want to use, and the caps don't even come close to accurately reflecting what color is in the pens for the most part.

I'm glad I bought them, but I'm looking for more colors.
2158455
I actually love these pens. They write really well and smoothly, and the ink doesn't bleed through the paper. The only thing I don't really like is how it tends to taper in towards the point. It would be more comfortable to hold if it didn't fo that.
469480
The colors are beautiful and these write very smooth. I love writing with these. I'm not sure how well the decorative print will hold up on these but I think they are acceptable for the price.
4529253
i love these fountain pens.  I would love them better if the ink were very waterproof, but for a throw away pen, they are quite exceptional.
C
4451068
I love that there are so many color choices. I had issues with the purple, it just didn't write smooth, and the blue stained my board. Had to buy another brand for those colors. I love the fine tip on these though, just wish they all wrote consistently.
3384607
I love these pens, they're my favorite for taking notes or any type of writing I do, but the only con I have is that since I'm a lefty they do smear a little and leave my hand black when I'm done. If you try to use these for coloring I wouldn't reccomend it or even for using against a ruler, when you take the ruler away it leaves a slide mark! But if you're just looking for writing pens these are great
987665
I love the pens but mine were pretty dried out when I received them.  I got very little writing out of them but if not for that I would've rated them  5 stars.
2455709
Writes wonderfully, but seems to run out quickly (which is why I had to buy in quantity!)
1728798
They write beautifully.  However, I have had them only for about a month and I seem to lose a couple of pens a week to leaking.  Too bad, as they are perfect for my needs