I have all of the six pack sets of spectrum noir markers and have started buying the refills. I absolutely love these markers. I also have a few copics, and I find the spectrum noir to be compatible. In order to blend well, you have to make sure you use the pen numbers that are next to each other and not stray to far from those numbers. I plan to buy the 24 marker sets as soon as I can afford them. I find them much more affordable than copics and just as good. I can't justify paying $8.00 for one marker when I can purchase 6 for that price. I guess it comes down to individual choice in the end. As long as you are happy with what you choose, that's all that's important.
I'M A SURVIVOR!!!!