We don't have small children in our house these days, so cordless isn't really an issue for me. (Youngest was almost 5 when we moved here). We went with top down, bottom up in all our honeycomb blinded windows. (The formal living/dining have roman shades). They are great. We almost never use the bottom up. Only the top down.
My daughter uses the top down so she gets light in her room, without anyone being able to see IN her room. Son has recently started looking at the stars from his bedroom window at night (top down lets him put his telescope on his desk and not have to crouch on the floor). I use top down in my bedroom, and when I am walking around not fully dressed, I don't worry what anyone is seeing... b/c they can only see above my head, but it lets in plenty of light.
Breakfast table looks out onto the patio/pool. I often will drop them all the way down to almost the bottom (that way I have full view of the kids in the pool), but I almost never raise them from the bottom up to the top. I guess because you end up with that 3 inches of blind stacked at the top of your window, that once you've become accustomed to the "whole view" at the top, you hate having that stack of "heaviness" at the top.
It also means that I can lower them halfway down and get light in, without small visitors being able to see the pool outside and be tempted by it. :)