These are my cards so far and for this review!
I have found that the pens do have a learning curve as stated on their web site. I watched all the company's learning videos before beginning even my first card! I like them best when using them in medium spaces like flower petals. My first card above may have been too difficult for my first try but as I learned just how long each "charge" would last I started picking more appropriate projects for learning. The best image for using the pens in all their values was the Hydrangea. I was able to color a multitude of petals with each charge from light to very dark.
On the Tulips I learned to mix colors for more depth and realistic flower colors. On the roses, I just pretty much stuck to the pink throughout and each petal was done from light to darker with one pen. I did add a bit of another color to deepen the shadows and this is where I would love to have had another darker shade of pink for such times. I would wish that as the company grows they would add a few "in-between" colors. They have 3 greens, 3 blues, two yellows etc. I would like at least another pink (darker) and maybe another red, purple, etc.
All in all I think that it has a very pleasant look to it and with the learning, of course, comes a more beautiful outcome. Judging from comments I got in my gallery on Splitcoaststampers, people in general really like the look!
Don't buy them thinking they are like Copic Markers because they ARE NOT. If you are proficient with Copics you WILL have to relearn with this system.
Don't get discouraged though. Just like learning any new coloring system, you WILL get better at it!!
So these are my thoughts about the Chameleon Pens and I hope this has helped.
I have not refilled my pens yet so I can't really comment on the ease or difficulty of that part.
Stamp credits: Make It Crafty digi's, Power Poppy Digi, Our Daily Bread Designs, Inky Antics