Great Pens, But Not Really "Fine Point"
924109
I purchased these pens for labeling portable hard drives and other computer equipment.  The paint works exactly as expected, dries very quickly, and is really scratch resistant.

However, these are not "fine point!"  Because the tip acts more like a brush and less like a felt tip marker the line these pens make is very wide.  To write clear letters they need to be at least 1/4" tall.  See the attached image for a comparison between a ball point pen and the "fine point" paint pen.
890131
These are the only pens fine enough for my needs.  They are very nice pens.  The only complaint I have is the capacity of the ink in the reservoir.  Although the fine tips only dispense a small amount of ink, the reservoir capacity is small and I keep running them dry and have to buy new ones too frequently.  Otherwise they are superb pens.  I will buy more, I just wish I didn't have to buy them so often.
4416987
These are my new favorite writing pens. It looks like they might be marketed more towards drawing with their pretty colors, but don't discount them for writing. They're not too fancy, but the clip is solid and isn't about to break any time soon, the grip is tall and has just the right amount of friction, and they're pretty much the exact right diameter for my hands (wider than normal smallish pens, but not ridiculously wide). Most importantly, the writing action is excellent; even on marginal paper I've found they almost never skip. On the same paper, I've had frequent skipping and annoyance with the frequently-recommended Uniball Signo 207, the classic Pilot Hi-Tecpoint, and the Hi-Tec-C/G-Tec-C. I never have to scribble with my Juice pens to get them started, nor go back over part of the paper that they refuse to write on. I really like the 0.5mm size for writing, since it's fine but not so fine that it scratches paper and interrupts quick writing. The only downsides are that these pens can't be found in stores in North America, and are hard to get online in 0.5mm in a set of nice dark writing-friendly colors (Black / Red / Blue / Green).
4413150
I do love these, but a finer tip would be better. But these pens are great for those spots that don't need a fine line. It's about the size of a Sharpie fine point, but I would like a finer line. Not a complaint against this product. It works as it's supposed to.
3910078
I LOVE these pens!! I used to hate all the gel-like pens and preferred the way ball points feel when writing, but these pens are wonderful. They write smoothly and the ink dries quickly, so no smudging. They're kind of like really really fine point sharpies, so they make my writing look really nice, but it also doesn't show through to the other side of the page very much.
1893813
I love the way these pens write.  My only gripe is it also depends on what kind of paper it's writing on.  For instance, the gel roller is spotty when writing on a Disney Autograph book so my daughter's book is filled with spotty signatures from characters.  I use it now for note taking etc and it works smoothly on regular paper, loose leaf or post its.
1752049
I looked at the details of the product, and it is everything that was described except that the pens are medium tip not fine tip as described.  Nevertheless I am very happy with the pens!  They are a great bargain, write smoothly, and do not smear at all.  I was thinking that they would be like fountain pens that I have used in the past that grab the paper and take forever to dry, but this was not the case.  The blue is a very deep rich color of blue.  If you are looking for a fine tip pen I don't think you will find them at this price, and if you are willing to go to medium you won't be disappointed.
3075784
I bought these last night from target for $3.89.. So the price on Amazon is a bit ridiculous. Overall - they are awesome pens, very pretty, very smooth. I did have a problem with the pink one at first - it seemed to have "died" mid sentence, but it's working fine now. Also, when you're writing they tend to come unscrewed sometimes - which is why I'm giving 4 stars.
3126823
I like these OK and do use them. I originally bought them for my Bullet journal/and planner. They are *very* fine tipped. Some of the colors are dark enough to read and some are very light they I have to rewrite the letters to even see the color. So basically I use very few of the actual colors in this box. So a lot of the pen colors I'll never use because they are to light to even see the words. So I would recommend these for writing.

You have to be very careful with how much pressure you put on these because they are somewhat fragile. I can see the tips of these breaking or bending pretty easily.

They are good for doodling and playing around with...if your into that. I wish all the colors were more saturated. I guess that's my real complaint.

They don't bleed through paper and they dry really fast so you don't have to worry about any ink smudging. That's really cool. And a must have for me.

So just realize what your buying and what you'd be using these for. I'd definitely repurchase the more saturated/darker colors (dark blue, red, orange, green, etc) though, because I do use those daily. They are also slim enough I can carry a few of them around without taking up much space.
1433927
I really like how these pens write. I don't like thin points, and this has a nice solid thick point. I just wish the ink lasted onger
1853360
I have been using zebra f-310 pens for over ten years now. They provide excellent, smooth writing  for note taking and even drawing. However, recent purchases of these pens have not had the best ink quality: low density, stoppage, etc. which can be very frustrating while taking notes. If you have the time to scribble to get the ink out, by all means buy these pens- but those of you who get frustrated with dry ink- think twice
3767620
As markers these are great my issue is they claim to be "fine point" and they are not even close to a fine point. They do have a point on the end but not the type I think of when I think of a fine point. They are great typical sharpie type markers and work great, my only issue is with the point.
2440662
I actually really like the pens, maybe even more than the Pilot G2s that seem to be the standard.  They're sturdy enough not to feel cheap (think using an inexpensive mechanical pencil) and the ink flows easily but not too quickly.  Also, they're twenty cents each!  That's great for gel pens.  You get two boxes of black, two of blue, and one of red, so I might not get a lot of use out of some, but it's still a good deal and they're still good pens.
139745
The pens have a lovely fine point that works very well. However the pens do not seem to last very long. I ensured to cap them properly. The first few I've used have expired rather rapidly.
2953945
I really like the idea of using a smooth writing pen and I'm obsessed with finding pens and office supplies, however, I was a little disappointed that these were so full, I prefer a smaller tip but they're a great pen! These are M nibs even though they say they are fine. I'm a little disappointed with that.
4198093
These pens are great! I love the Pilot G-2 Pens here that are 0.38, especially at work I write in very fine spaces. I ordered these for small lines in my planner, as well as my desk calendar. They write smoothly and I love that every color comes out vivid on paper. This makes things easier to notice and pay attention to. I gave it 4 starts because I noticed that some of the pens would separate from the metal tip when I would pull them out of the cap. I also notice that they are very loose after screwing them back on so I am constantly screwing them back on. However, if you are a pen fanatic like I am, these pens surely will not disappoint.
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.