I've held off on making a post about the Cones until I could get a decent amount of playtime with them, and I have to say that I am simply not a fan of them.
Combat is already a convoluted mess in SS13 as it is, and the Vision Cones make every single shootout, brawl, or scramble that I've been involved in look like a Three Stooges skit. While the idea of sneaking up behind someone is a cool novelty, I don't think it really is worth it, considering the clumsiness that follows with everything else.
Xenobiology is where my main complaints come in.
I used to play Xenobiology rather regularly, as it was rather easy to get into the flow of things. I could easily click behind myself to drag slimes out of containment pens, and drag mass numbers of them in a short few moments. With the Vision Cones, however, it makes it an effort of 'how long am I going to put up with this before I give up and go to Cryo'. What would've been a five second endeavor, now increases to a ten to fifteen second endeavor. These times stack up, and what would normally take around five to ten minutes to complete, now takes upwards of twenty to twenty five.
While minor, I believe that this issue extends to any Department that requires a lot of dragging multiple objects.