Pens like this Uni-Ball Jetstream Color Ink Series Blue Black 0.5mm are a prime reason why I took up the #OnePenOneDay project. This pen had ben lost in the shuffle of pens from my old office at my previous employer. I found a bunch of pens like this in a ziploc in a desk drawer at my house just crying out to be used.
The Color Ink Series Jetstreams are as good as advertised. If you can get past the funky barrel (nearly every other Jetstream barrel I have used is better than this one), then you will find a great writing, uniquely colored ink waiting for you. I love this series, and I hope one day Uni-Ball expands these ink colors into different barrel styles.
By the way, this is the second #OnePenOneDay pen I have found that I don't have a traditional review on. I'll be sure to add it to the list. Here is the light blue review for reference purposes.