Updated the original post to reflect my near-complete lack of inventory. I'll be picking up supplies and starting production back up in a couple of days.
They're as comfortable as any foam padding you might install. Electronics such as cooling fans, voice amps, or rangefinder servos usually are accommodated by removing a small section of foam here and there. It really depends on what you're putting in, how it's laid out, how big your noggin is, and which helmet you're working with.How is the comfort for trooping? Do they accommodate fans?