There were three colors that came in the set that I got to try out for free: pink, purple, and blue. I'm glad the sent colors that were a bit out of the norm because it's more fun using them. The pink was more of a hot pink, leading to a red. The purple was very dark, leaned real close to black. It was just a bit too dark for me. The blue was a turquoise color; not very dark.
All the ink in the pens came out super saturated, no skipping, and it dried pretty quickly. If you run your hand across it right after writing you may get it smudge. I found it hard to get it to smudge though because it does dry quickly.You can refill these pens, but I didn't see refills for these colors. The grips are a bit hard, but not uncomfortable at all. I have smaller hands and find pens with larger grips to be hard to hold. The retractable part of the pen works great, no issues with that.
I did try using them for my adult coloring books and they do work great, but not very good at layering. Because they don't really smudge I can't blend very well, but that's okay. I still think you can use them for coloring, if you enjoy using pens to color.
Overall, they're great pens that I'll use over and over again. The ink writes so smoothly, it's just amazing. I know I'll have to fight the kids to keep them from leaving with them to school.
Disclaimer: I did receive a three pack of BIC Gelocity pens for free in return for my honest review.