Since these elements are solid hunks of glass, you'll also be carrying a lot more weight with you. That's the second major downside to full frame -- the larger and heavier gear you have to carry ...
Aluminum structure, self supporting glass, limitless number of rails, ah!60 thermal insulation up to 0.708W/m².K, sound insulation: 44 dB, security RC4, ah!38 thermal insulation up to 0.816W/m² ...