Honestly this is a really, really fabulous pen for whiting out areas in need of correction. I've tested at least three other gel pens against it and in order of similarity, some either held up well or just did not match the opacity and flow of this pen.

http://www.jetpens.com/Sakura-Gelly-Roll-Regular-Gel-Ink-Pen-0.4-mm-White/pd /531 Held up marvelously in terms of opacity and flow and to be so cheap I was really surprised by how well it worked in compare to the Uni-ball. The Uni-ball is fantastic if you have to spot correct a semi largish area but the broadness of the pen tip makes it harder if you do very fine spots so the 0.4mm of the Sakura is a good twin to the 0.8mm of the Uni-ball.

http://www.jetpens.com/Pentel-Hybrid-Gel-Grip-Gel-Ink-Pen-0.8-mm-White/pd/50 0 this one was just not as great as I had imagined it would be. For the cost which is close to the Uni-ball Signo Broad, I really did expect for this pen to be just as opaque but the ink was actually rather thin over the pens and I tested this against a variety of inks. It just did not do as well as the Uni-ball and Sakura.

http://www.jetpens.com/Pentel-Sunburst-Metallic-Gel-Ink-Pen-0.7-mm-Silver/pd /1309 Using the silver as a kind of aid for anyone considering on buying the Pentel Sunburst Gel Ink Pen in White should JetPens ever bring it in stock. Still medium tip and much like the Hybrid, it was just not as thick as it could have been. Repeated layering doesn't seem to be a huge problem but I like being able to put down a coat of white from the onset.

In summation, if you draw, stick with the Sakura or the Uni-ball. Pentel is a great pen company but they just need to thick up their white or make it more opaque.

For some reason white is a hard color for most gel pens to get right, but Uniball is the best I've tried (and I've tried a LOT). It's smooth and bold, and doesn't have have the "I'm acting like I'm dry even though it's clear I'm full of ink" issue a lot of gel pens seem to have. If you're looking for an excellent white pen, this is it!!

I'm kind of disappointed with these because I can't use them for what I really wanted them for, and I bought 2 :\

The white that comes out is a thick white, but the width of the line that the pen makes is too thick for the kind of detailing I wanted to do.
Also, there is a peak/ball wherever you lift up the pen. For the most part it settles down. It's not a huge deal, especially if you're just using them for writing, but you see the little dot at the end of a line... I'm a little picky because I'm using them for artwork.

It just depends how picky you are if this would matter to you or not ^_^;

If I had bought these in a retail store, I probably would end up returning at least one of them to get something else, since I think it will take awhile to use up just one for what else I can find to use them for on artwork.
I wanted them for a fast and more convenient way of making line details, but they can at least be used for a quicker way of doing dot detailing ( quicker than my dip pen and white ink )

So, that is just my opinion based on what I was looking to use them for.
It's not a very expensive item, so if you're looking for a nice thick white ink, I'd recommend trying one ( but only if you're already buying over $25.00 worth of items to get the free shipping :)

I loved this pen! it didn't skip and its great for touch up on drawings and manga!
*recomend this to any manga drawers*

I just received mine. Best white gel pen yet that I have tried! Super white, non transparent, writes well on all paper surfaces I've tried. I ordered 5 of them and very happy!!!

I use white pens to write on dark surfaces, cards, and letters as I bought some dark stationary a while back that I like very much. However my search for a white pen, that doesn't write like a correction pen or white out has been futile, until now. This pen works! The ink shows up extremely well on dark paper, cards and other surfaces, such as writing on photo's for notes or scrapbooking. Excellent pen, ink, thickness, etc. I can't say enough good things about this pen. It would be an understatement to say that I have spent over a hundred dollars to find a white ink pen that just worked. From Jelly Roll's to correction ink pens, white paint markers, I've tried them all. THIS IS THE REAL DEAL!

I draw manga and occasionally color them, so a good white gel pen is handy to have. This, is not. For small shines in the eyes it's alright, the flow of the ink is generally okay, but it seems very runny. I have to use multiple coats to get it pure white over dry marker ink and God forbid I try to use it to make a minor touch up. It takes forever to dry, which is problematic seeing as you need at least two coats for opaque white ink. Overall, I wouldn't pay $2.50 + Shipping to get this again. Not worth the effort to use.

I got this pen bc the reviews here were all positive. Maybe I was just unlucky and got a bad one. :( From the first day i tried using this pen, it didn't work. It made double lines (two white lines and blank in the middle), the flow was uneven and the pen squeaked. I tried repeatedly over time, even tried to make the ink holding section warm up but no avail. It was such a disappointing experience, that i forgot about this pen at all until just now because i'm looking for a new one.

I've had two of these, and the roller balls clogged and jammed up before the ink ran out.

Writes on glass if you get it started on paper first. I got this pen for writing on dark objects, such as raised lettering black on black plastic. On water based fountain pen ink the bleed through is about 50%. On Pilot G2 gel ink about 33%, but I was not looking for a correction pen, so that's OK with me.