I use these for quick drawings with a sharpie marker. the 110lb is heavy enough to hold up to professional art markers but it doesn't soak up the ink like some lesser quality card stocks will. I use about 500 sheets in a weekend. It's absolutely perfect for what I do. Even if it's been rinted or copied it still hods up.
My daughter was making up 6 books for a spacific Junior age level badge. She needed sturdy durable pages. Rather than laminating pages she chose to print the pages on card stock. She found it to be less expensive and less trouble. The only thing left to do after that was to punch holes construct the binders and deliver them to their destinations; the 4 regional offices of Girl Scouts of Western Ohio Carriage Hill Stables and the Piqua Public Library.