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From the perspective...
January 29, 2011
Verified Purchase
From the perspective of a university student, this pen is excellent. From working out mechanisms in organic chemistry to just simply writing (notes or essays), this pen does an outstanding job.

Compared to the Uni-ball Signo RT UM-138 (0.38), this pen is better built, has a slightly more comfortable grip, has a much larger volume of ink, and writes with the same "thinness" (but with a darker black). The RT's black ink always have looked faded to me and they all definitely run out of ink way too rapidly or even a mediocre writer/drawer/whatever.

The RT has the "clicker" ability (which I originally wanted this pen to be and would buy another one if it were a "clicker") but the cap removal process isn't a big deal. I've actually started to like the look of the cap and the way it snaps on makes it feel like it's a high class pen.

Overall, this pen is one of the best that I've used.
10 people found this helpful
A marvelous everyday...
September 1, 2011
Verified Purchase
A marvelous everyday pen. This pen is my favorite. I have been ordering other pens to try them out and I always end up coming back to this one. I have gone through 11 of these pens so far and plan to continue using them. Some may find the line too thin, but I like it. The rubber grip seems to wear out and get a bit loose over longer periods of time (after replacing the inkwell once or twice). The cap also becomes a touch loose over a similar time period. I always put two or three of these on any Jetpens order I make. At the risk of making these pens be out of stock more frequently, I would recommend this pen to anyone looking for a hardworking, high quality, everyday pen.
8 people found this helpful
Not sure what's going...
March 21, 2016
Verified Purchase
Not sure what's going on with the black ink lately. I have loved these for use with watercolors for a long time now. Purchased some black and black-brown pens as replacements for ones that had run out. The black-brown ink is just fine, no bleeding or smearing. However, the three black pens I purchased (.5, .38 and .28) are reactivated by water like most other pens would be. I'll keep them for use with dry media, but now have to find a gel pen I can use with my watercolors.
4 people found this helpful
i bought this pen expecting...
March 28, 2014
Verified Purchase
i bought this pen expecting to be able to ink drawings for watercolor since it said it was waterproof, but this pen smears SO easily i'm incredibly disappointed.

also, as others have said, the ink flows out of the pen very smoothly, but the actual design of the pen makes it a bit uncomfortable to write with. it may just be that it's a bit wider than im used to
5 people found this helpful
The best everyday pen...
June 11, 2011
Verified Purchase
The best everyday pen sold by JetPens. Can be used for writing and for drawing. Waterproof. Mitsubishi (Uni Ball) makes fantastic products. My favorite brand.
4 people found this helpful
Nice pen, although I...
June 15, 2016
Verified Purchase
Nice pen, although I understood these were waterproof — not so, a bit of moisture from a summertime hand will smear the ink, so cannot imagine what might happen with a spilled glass of water. So Micron it remains for me though am always on lookout for a better pen. It's important to note paper used — I use Clairefontaine paper, excellent for Microns and just about every other pen. A toothier paper in a journal will make Micron writing slower, less flow. But a waterproof pen is essential, as is permanence of course.
1 person found this helpful
These are great pens:...
March 4, 2016
Verified Purchase
These are great pens: precise without being scratchy. They are my go-to pen now when I am too impatient to use a fountain pen.
1 person found this helpful
With this pen's fine...
November 12, 2015
Verified Purchase
With this pen's fine line I was able to fit easily 5 lines of text in a standard rule line of a notebook. It took little time to dry on a 'semi gloss' type workbook paper, to avoid smudges. I fully enjoyed using this pen and it has made the short list of the 10 different pens that I am testing.
1 person found this helpful
I was upset because I...
October 30, 2015
Verified Purchase
I was upset because I selected the wrong pen at checkout apparently but this one is amazing. I am a pilot hi-tec fan but this is officially my favorite pen right now.
1 person found this helpful
Perfect for annotating...
October 9, 2015
Perfect for annotating charts.
I need to make notes on sheet music, and the Signo UM-151 has a nice fine line and a variety of colors.
The 0.38 is a little thin for reading at a distance. The 0.50 mm is the best balance between a fine line and legibility
1 person found this helpful
Hank Sinatra
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