I've been looking at Critical Thinking Co website & trying to figure out which one I should buy for my ds who will be in 6th grade next year. I want to emphasize Reading Comprehension skills. There are several on there that I'm interested but can only buy one. For those who have used this, would you choose Reading Detective A1, Building Thinking Skills Level 2, Word Roots A1 or Mind Benders 3? Also, does anyone think the software is any better than the book or is it just a matter of preference? I think my ds would enjoy the software. Any thoughts?