I am totally not a fan of the Spectrum Noir markers, not only are they cheap (in price), but they are "cheap" in quality too (when taking off some of the caps sometimes, the whole marker came apart!). I had the full original set (like 160 or something), but I ended up sending them back. They didn't blend anywhere close to as good as my Copics and the tips were kind of lame (they come with a bullet and a broad tip, no brush). They really wick out so as soon as I would touch them to paper, they spread and bled everywhere and I could never get them to really "behave". I even tried their recommended paper and I never had any luck with them. I am a heavy handed colorer and they are just not for me. I think maybe if you had a really really light touch you could get them to work better for you, but only to a point. The colors just end up looking blotchy and not well blended even on the best samples I have seen with the markers.
Even with the best samples, the Spectrum Noir colored images don't look ANYTHING like some of the Copic coloring out there (not even the BEST Copic colored images, even the mediocre Copic colored images are better!). I think ANYONE can have great luck with the Copics, I just don't see that being the case with the Spectrum Noirs. The Copic colors just appear richer and you just get sooo much better blending with the Copics. Of course, that could be because the Spectrum Noir line doesn't have tons of colors yet, but that's still a big issue if you want to blend, but then again, if you don't want to blend, why even go with alcohol markers?
I feel like Copics are better quality and much much easier to use. You pick them up and with the right paper that you like, you can be blending super quickly. With the others, I think it is a LOT more work to try to get them to do what you want them to do and even then you are left with lack of colors & quality issues.