I'm a fan of windows. I have 3 on my AT Summit. The rear hatch window, front slider window and a Tern Overland window on the passenger side. They offer good visibility, great views when hanging out inside, fresh air to flow through and are great when I have my dog in the back. The Tern Overland window is double pane so it offers great insulation with zero condensation. The other two are single pane. I simply cut some reflectix insulation to fit into the frame of the windows. That solves that insulation and condensation issue. The only reason I would not get windows if you want that for security. Or if you do not like visibility, fresh air and nice views.