Sailor Double Sided Pocket Brush Pen - Medium - Black & Gray Ink

The gray on this stopped working quickly. I will not purchase it again.

I recently ordered several bristle and felt tip brush pens from this site and this one has been my favorite. I'm a little bit apprehensive about felt tip because they tend to fray after continuous use but this one hasn't yet. It provides a very smooth line with enough room for variation in line width with both ends - thick and thin. Will probably be getting more. Love that it's waterproof and doesn't smear with markers!

I'm fascinated with brush pens for some reason, so I picked this up recently. I really like the double tips, though both are fairly soft and take some finesse to use well. That's true with all brush pens, though, so it's not a bad thing.
The slim tip is capable of hairlines, so in one pen, you've got a very wide range of line widths. The ink doesn't seem as dark as the Kuretake pen, or the Sailor Kiwaguro ink in the Fude pens, but it has a nice sheen when dry that the others don't.
Water resistance seems quite good, with a tiny bit of smearing from the slim end, but I believe that's extra ink that didn't soak into the page.
Overall, a bargain for the price, and a fun tool to carry around.